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cosecant in trigonometry, the secant of the complement or the reciprocal of the sine of a given angle or arc.
infinitive in grammar, the form of a verb that is unmarked for person, tense, or aspect, and that functions as a noun, adjective, or complement, such as "to leave" in "To leave now would be a mistake". [1/2 definitions]
it used as the subject of the verb be in anticipation of the complement. [1/6 definitions]
linking verb in grammar, a verb that serves mainly to connect a subject and a predicate complement; copula.
obverse in relation to something else as a counterpart or complement. [1/5 definitions]