/ ˌkɔɪtəs ɪntəˈrʌptəs; ˌkəʊɪtəs; NAmE ˌkoʊ-/ noun
[ U ] an act of sexual intercourse in which the man removes his penis from the woman's body before he ejaculates , in order to prevent the woman from becoming pregnant
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WORD ORIGIN
from coitus + Latin interruptus interrupted.