acidic
US /əˈsɪdɪk/
UK /əˈsɪdɪk/
- Adjective
- Containing acid
B1Moreat least
US /æt list/
UK /æt li:st/
- Adverb
- As a minimum
- Not less than
- Phrase
- No less than; at the minimum
- Used to indicate that something is positive in a bad situation.
C2Moreatom
US /ˈætəm/
UK /'ætəm/
- Noun
- Smallest bit that matter can be broken down into
B1Morecalculate
US /ˈkælkjəˌlet/
UK /'kælkjʊleɪt/
- Transitive Verb
- To find an answer using mathematics
- To make an educated guess about something
B2Morechannel
US /ˈtʃænəl/
UK /'tʃænl/
- Noun (Countable/Uncountable)
- Long hole dug in the ground, e.g. to move water
- TV or radio station or its programs
- Transitive Verb
- To dig a long hole for carrying water
- To send (e.g. money) to a certain place or person
B1Morecharge
US /tʃɑrdʒ/
UK /tʃɑ:dʒ/
- Verb (Transitive/Intransitive)
- To run quickly toward someone to attack them
- To ask for money as a price for a service or goods
- Noun (Countable/Uncountable)
- An attack by running quickly toward someone
- A price for a service or goods
A2Morechemistry
US /ˈkɛmɪstri/
UK /'kemɪstrɪ/
- Uncountable Noun
- The study of the structure of substances
B1Morecomprehension
US /ˌkɑmprɪˈhɛnʃən/
UK /ˌkɒmprɪˈhenʃn/
- Uncountable Noun
- Act of understanding, e.g. a reading text
- The scope or range of something.
B1Moreconcentration
US /ˌkɑ:nsnˈtreɪʃn/
UK /ˌkɒnsnˈtreɪʃn/
- Noun (Countable/Uncountable)
- Amount or number of something in a thing or place
- Paying (a lot of) attention to a task
A2Moreconjugate
US /ˈkɑndʒəˌɡet/
UK /'kɒndʒəɡeɪt/
- Adjective
- (Of leaves) having only one pair of leaflets
C1Morecumbersome
US /ˈkʌmbəsəm/
UK /ˈkʌmbəsəm/
- Adjective
- Being slow, heavy or difficult to move
C1TOEICMoredefinition
US /ˌdɛfəˈnɪʃən/
UK /ˌdefɪˈnɪʃn/
- Noun (Countable/Uncountable)
- Explanation of word's meaning, as in dictionaries
- The sharpness of an image on a screen
A2TOEICMoredegree
US /dɪˈɡri/
UK /dɪˈgri:/
- Noun (Countable/Uncountable)
- Amount or extent of something
- Unit for measuring temperature or angles
A2TOEICMorediffuse
US /dɪˈfjuz/
UK /dɪ'fju:z/
- Transitive Verb
- To cause something to spread through a large area
B2Moredying to
US
UK
- Phrase
- Extremely eager or anxious to do or have something.
- To have a very strong desire or need for something.
A1Moreelectron
US /ɪˈlektrɑ:n/
UK /ɪˈlektrɒn/
- Countable Noun
- A negatively charged particle
B2Moreequilibrium
US /ˌikwəˈlɪbriəm, ˌɛkwə-/
UK /ˌi:kwɪˈlɪbriəm/
- Noun (Countable/Uncountable)
- A state of balance or harmony
- Calm, quiet, undisturbed emotional state
C2TOEICMorefluoride
US
UK
- Noun (Countable/Uncountable)
- Chemical added to water to improve tooth health
- The addition of a fluoride compound to drinking water or dental products to reduce tooth decay.
C1Morefraction
US /ˈfrækʃən/
UK /ˈfrækʃn/
- Noun (Countable/Uncountable)
- Small part of something
- A numerical quantity that is not a whole number (e.g., 1/2, 0.5).
B1TOEICMoregain
US /ɡen/
UK /ɡeɪn/
- Verb (Transitive/Intransitive)
- To increase in something, such as weight
- To get something wanted, needed or valued
- Noun (Countable/Uncountable)
- An increase in something, such as weight
A2TOEICMoregenerate
US /ˈdʒɛnəˌret/
UK /ˈdʒenəreɪt/
- Transitive Verb
- To create or be produced or bring into existence
- To create electricity, heat, energy and power
A2TOEICMorehave at
US
UK
- Phrasal Verb
- To attack someone or something.
- To begin doing something with enthusiasm.
A1Morehave to
US /hæv tu/
UK /ˈhæv tə/
- Auxiliary Verb
- Must do
A1Morehydrogen
US /ˈhaɪdrədʒən/
UK /ˈhaɪdrədʒən/
- Uncountable Noun
- Lightest of all chemical elements
B1Morein order to
US /ɪn ˈɔrdɚ tu/
UK /in ˈɔ:də tu:/
- Preposition
- For the purpose of; with the aim of.
- Phrase
- In a specific sequence or arrangement.
- With the aim of; for the purpose of.
C1Moreion
US /ˈaɪən/
UK /'aɪən/
- Noun (Countable/Uncountable)
- Atoms with either a positive or negative charge
B2Morelog
US /lɔ:g/
UK /lɒg/
- Verb (Transitive/Intransitive)
- To move a certain distance or speed, as recorded
- To leave a website or computer account
- Noun (Countable/Uncountable)
- Detailed account of events and progress on journey
- Piece of a tree that has fallen or been cut
B1Moremolecular
US /məˈlɛkjəlɚ/
UK /mə'lekjələ(r)/
- Adjective
- About or caused by molecules
B2Moremolecule
US /ˈmɑlɪˌkjul/
UK /ˈmɒlɪkju:l/
- Noun
- Two or more atoms chemically combined
B2Morenegative
US /ˈnɛɡətɪv/
UK /'neɡətɪv/
- Noun
- The opposite to a positive electrical charge
- In grammar, containing words such as 'no' or 'not'
- Adjective
- Being harmful, unwanted or unhelpful
- In mathematics, being less than zero
A2Moreneutral
US /ˈnu:trəl/
UK /ˈnju:trəl/
- Adjective
- Something with pH value of 7
- Having no positive or negative electrical charge
- Noun (Countable/Uncountable)
- Color that is dull and not bright, such as gray
- The rest position for gears in a car or vehicle
B1Moreoxygen
US /ˈɑksɪdʒən/
UK /'ɒksɪdʒən/
- Uncountable Noun
- A gas in the air that we need to breathe
- Oxygen administered as a medical treatment.
B1Morepartially
US /ˈpɑ:rʃəli/
UK /ˈpɑ:ʃəli/
- Adverb
- In part; in some degree; not wholly
B1Moreph
US /ˈpiˈetʃ/
UK /ˈpi:ˈeɪtʃ/
- Noun
- Acidity or alkalinity value of a solution
B2Morepi
US /paɪ/
UK /paɪ/
- Noun
- The ratio of the circumference to the diameter
B2Moreportion
US /ˈpɔrʃən, ˈpor-/
UK /'pɔ:ʃn/
- Noun (Countable/Uncountable)
- Serving of food that is intended for one person
- Part of something shared that belongs to a whole
- Transitive Verb
- To separate something to divide among people
B1Morepotentially
US /pəˈtɛnʃəlɪ/
UK /pə'tenʃəlɪ/
- Adverb
- That could happen or become reality
B1Moreproton
US /ˈproʊtɑ:n/
UK /ˈprəʊtɒn/
- Countable Noun
- Tiny part of atom with positive electrical charge
B2Morereact
US /riˈækt/
UK /rɪ'ækt/
- Intransitive Verb
- To change when mixing with other chemicals
- To behave or make a change in a particular way
A2Morereaction
US /riˈækʃən/
UK /rɪ'ækʃn/
- Noun
- Bodily response to a drug or something eaten
- Feeling or action in response to something
A2Morereadily
US /ˈrɛdəli, ˈrɛdli/
UK /ˈredɪli/
- Adverb
- In a quick and easy manner
- In a quick and willing manner
B1Morerefer
US /rɪˈfɚ/
UK /rɪ'fɜ:(r)/
- Verb (Transitive/Intransitive)
- To talk about or write about something
- To give information about something
A2TOEICMorerelate
US /rɪˈlet/
UK /rɪ'leɪt/
- Transitive Verb
- To demonstrate a logical relationship between
- To understand or sympathize with, e.g. a problem
A2TOEICMoreresonance
US /ˈrɛzənəns/
UK /ˈrezənəns/
- Noun (Countable/Uncountable)
- Continuing to make a loud clear deep sound
- The quality in a sound of being deep, full, and reverberating.
C2Morerigid
US /ˈrɪdʒɪd/
UK /ˈrɪdʒɪd/
- Adjective
- Stiff rather than flexible
- Very fixed in your opinion or habits
B1Moreside with
US /saɪd wɪð/
UK /said wið/
- Phrasal Verb
- To support one person or group against another in a disagreement.
A2Moresolution
US /səˈluʃən/
UK /səˈlu:ʃn/
- Noun (Countable/Uncountable)
- Mix of a liquid and a solid or a gas
- Way to solve or deal with a problem
A2Morestrength
US /strɛŋkθ, strɛŋθ, strɛnθ/
UK /streŋθ/
- Noun (Countable/Uncountable)
- Condition of being strong
- The quality or state of being physically strong.
A2TOEICMorestructure
US /ˈstrʌk.tʃɚ/
UK /ˈstrʌk.tʃə/
- Noun (Countable/Uncountable)
- The way in which the parts of a system or object are arranged or organized, or a system arranged in this way
- A building or other man-made object.
- Transitive Verb
- To plan, organize, or arrange the parts of something
A2TOEICMoretendency
US /ˈtɛndənsi/
UK /'tendənsɪ/
- Noun
- Likelihood to behave in a particular way
A2More
Vocabulary
- have at: To attack someone or something.
- at least: As a minimum
- dying to: Extremely eager or anxious to do or have something.
- in order to: For the purpose of; with the aim of.
- have to: Must do
- side with: To support one person or group against another in a disagreement.
- potentially: That could happen or become reality
- structure: The way in which the parts of a system or object are arranged or organized, or a system arranged in this way
- negative: The opposite to a positive electrical charge
- completely: In every way or as much as possible
- comprehension: Act of understanding, e.g. a reading text
- sense: Certain mental feeling or emotion
- strength: Condition of being strong
- measure: Plan to achieve a desired result
- molecule: Two or more atoms chemically combined
- neutral: Something with pH value of 7
- tendency: Likelihood to behave in a particular way
- definition: Explanation of word's meaning, as in dictionaries
- portion: Serving of food that is intended for one person
- concentration: Amount or number of something in a thing or place
- fraction: Small part of something
- explain: To make clear or easy to understand by describing
- refer: To talk about or write about something
- form: Sports team or person's current winning record
- charge: To run quickly toward someone to attack them
- generate: To create or be produced or bring into existence
- reaction: Bodily response to a drug or something eaten
- rigid: Stiff rather than flexible
- reason: To think and make conclusions in a logical manner
- equal: Same in shape, size, or number
- accept: To agree to receive or take something offered
- degree: Amount or extent of something
- relate: To demonstrate a logical relationship between
- oxygen: A gas in the air that we need to breathe
- solution: Mix of a liquid and a solid or a gas
- gain: To increase in something, such as weight
- leave: To go away from; depart
- react: To change when mixing with other chemicals
- lot: What happens to a person in life from chance; fate
- channel: Long hole dug in the ground, e.g. to move water
- log: To move a certain distance or speed, as recorded
- partially: In part; in some degree; not wholly
- act: To behave in a certain way
- chemistry: The study of the structure of substances
- hydrogen: Lightest of all chemical elements
- readily: In a quick and easy manner
- great: Very good; better than before
- pick: Sharp tool used for breaking the ground
- equilibrium: A state of balance or harmony
- resonance: Continuing to make a loud clear deep sound
- include: To make someone, something part of a group
- cumbersome: Being slow, heavy or difficult to move
- understand: To know the meaning of language, what someone says
- atom: Smallest bit that matter can be broken down into
- acidic: Containing acid
- molecular: About or caused by molecules
- calculate: To find an answer using mathematics
- diffuse: To cause something to spread through a large area
- conjugate: (Of leaves) having only one pair of leaflets
- proton: Tiny part of atom with positive electrical charge
- electron: A negatively charged particle
- ion: Atoms with either a positive or negative charge
- fluoride: Chemical added to water to improve tooth health
- pi: The ratio of the circumference to the diameter
- ph: Acidity or alkalinity value of a solution
Get the full experience in the app
Learn anywhere with detailed sentence and usage analysis
01:03
She took a brave step forward, leaving behind her comfort zone to chase her dreams.
Vocabulary
- brave
adj. Having courage
- comfort zone
phr. A familiar situation where one feels safe
Explanation
a brave step is a noun phrase, where brave is an adjective modifying the noun step, meaning "a courageous step".
forward is an adverb modifying step, meaning "ahead".
The whole phrase serves as the object, answering the "what" of took (verb) — she took a brave step forward.
Get the full experience in the app
Look up words anytime with pronunciation, part of speech, and usage
brave
US/brev/
UK/breɪv/
adj.Brave
v.t.To bravely face
A2 Elementary
Get the full experience in the app
Practice speaking anytime and get instant pronunciation feedback
Try this speaking exercise.
Try practicing with this sentence.
80
0
Ken Lee posted on 2026/08/25Ever wondered what's really going on at the molecular level when we talk about acids and bases? This video breaks down the Brønsted-Lowry and Lewis definitions, explaining concepts like proton transfer and conjugate acid-base pairs. You'll also get a clear handle on how pH and pOH are calculated and what they tell us about a solution!
Learn this video on the APP!
The VoiceTube App has more in-depth practice for videos!