After coitus.
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post·co·i·tal -'kō-ət-əl, -kō-'ēt-əl adj occurring, existing, or being administered after coitus <a \postcoital contraceptive>
post·co·ital·ly -əl-ē adv
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post·coi·tal (post-koiґtəl) after coitus.Medical dictionary. 2011.