Physiology. = Latin emissio seminis.

Obsolete slang. An orgasm; an ejaculation. Cf. spend, v.1 15c.

The sudden ejection or emission (of seed, fluids, etc.) from the animal or vegetable system. spec. the discharging of the male sperm.

slang. The action or an act of ejaculating or achieving orgasm (cf. come, v. 22). Also (and in earliest use) in plural: ejaculated semen.