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    essential

    US /ɪˈsɛnʃəl/

    UK /ɪ'senʃl/

    • Adjective
    • Extremely or most important and necessary
    • Fundamental; basic.
    • Noun
    • A concentrated hydrophobic liquid containing volatile aroma compounds from plants.
    B1TOEIC
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    profound

    US /prəˈfaʊnd, pro-/

    UK /prə'faʊnd/

    • Adjective
    • Requiring deep thought; difficult to understand
    • Showing a lot of deep thought or understanding
    completely

    US /kəmˈpliːtli/

    UK /kəmˈpli:tli/

    • Adverb
    • In every way or as much as possible
    • To the greatest extent; thoroughly.
    effective

    US /ɪˈfɛktɪv/

    UK /ɪˈfektɪv/

    • Adjective
    • Working efficiently to produce a desired result
    • In operation; in force.
    A1TOEIC
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