Webster's English Dictionary

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copulate

cop.u.late \'ka:p-y*-.la-t\ \.ka:p-y*-'la--sh*n\ \'ka:p-y*-l*-.to-r-e-, 
   -.to.r-\ vi [L copulatus, pp. of copulare to join, fr. copula] 1: to engage 
   in sexual intercourse  of gametes  2: to fuse permanently  - cop.u.la.tion 
   n