エヤクラチオンMeanings1nounejaculationMedical/biological term for the discharge of semen; used in formal or clinical contexts. The more common colloquial term is 射精 (しゃせい).エヤクラチオンは男だん性せいの生せい殖しょく機き能のうの一いち部ぶです。Ejaculation is part of the male reproductive function.