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    complex

    US /kəmˈplɛks, ˈkɑmˌplɛks/

    UK /'kɒmpleks/

    • Countable Noun
    • Group of buildings all used for the same purpose
    • Adjective
    • Not being simple; having many parts or aspects
    comfort

    US /ˈkʌmfət/

    UK /'kʌmfət/

    • Transitive Verb
    • To try to make distressed person feel better
    • Uncountable Noun
    • Acts or words that reduce pain or sadness
    • State of being relaxed, warm or happy
    challenge

    US /ˈtʃæləndʒ/

    UK /'tʃælɪndʒ/

    • Noun (Countable/Uncountable)
    • An activity you wish to try that may be hard to do
    • Act of formally inviting someone to compete
    • Transitive Verb
    • To formally invite someone to compete at something
    • To question the correctness of something
    couple

    US /ˈkʌpəl/

    UK /'kʌpl/

    • Transitive Verb
    • To join something to something else
    • (Two animals) to engage in sexual relations
    • Noun (Countable/Uncountable)
    • Two people in a romantic relationship
    • Two of something; two people; a pair
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