intrōductīo, ōnis, f. [introduco],
a leading in , introduction : adulescentulorum nobilium, Cic. Att. 1, 16, 5: saeculi, a beginning , Tert. adv. Marc. 5, 6.
intrōductiō ōnis, f introductus, a leading in, introduction : adulescentulorum. ...
An Elementary Latin Dictionary