1. SYN: coitus. 2. In protozoology, conjugation between two cells that do not fuse but separate after mutual fertilization; observed in the ciliophora, as in Paramecium. [L. copulatio, a joining]
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n.
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cop·u·la·tion (kop″u-laґshən) [L. copulatio] sexual union between male and female; the act transferring the sperm from male to female; used particularly for nonhuman animals.Medical dictionary. 2011.