ETYM Latin initialis, from initium a going in, entrance, beginning, from inire to go into, to enter, begin; pref. in- in + ire to go: cf. French initial. Related to Issue, Commence.
Occurring at the beginning.
ETYM Latin primarius, from primus first: cf. French primaire. Related to Prime, Premier, Primero.
1. Not derived from or reducible to something else; basic; SYN. primitive.
2. Of first rank or importance or value; direct and immediate rather than secondhand.