1650s, "action of sowing," noun of action from inseminate. Meaning "infusion of semen" is from 1860.
1620s, "to cast as seed," from Latin inseminatus, past participle of inseminare "to sow, implant," from in- "in" (see in- (2)) + semen (genitive semenis) "seed." Meaning "to impregnate with semen" is attested from 1923. Related: Inseminated; inseminating.
inseminate in·sem·i·nate (ĭn-sěm'ə-nāt')
v. in·sem·i·nat·ed, in·sem·i·nat·ing, in·sem·i·nates
To introduce or inject semen into the reproductive tract of a female.