co-
co- var. of COM- used before vowels, h, and gn. as in L. coalescere COALESCE, cognātus COGNATE, cohērēs CO-HEIR; in extensive use from XVII as a living formative in the senses ‘together’, ‘in common’, ‘joint(ly)’, ‘reciprocally’. In math. repr. complement, in the sense ‘ … of the complement’, ‘complement of … ’, as in COSINE, etc.
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co-