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Entry 1 sense Webster, 1913

Counterterm

/(-t?rm`)/ · Coun·ter·term · IPA
01 n. A term or word which is the opposite of, or antithesis to, another; an antonym; -- the opposite of synonym; as, “foe” is the counterterm of…
  1. 1.
    A term or word which is the opposite of, or antithesis to, another; an antonym; -- the opposite of synonym; as, “foe” is the counterterm of “friend”.