Nouns

(n)maid, maidenan unmarried girl (especially a virgin)
(n)maiden over, maiden(cricket) an over in which no runs are scored

Adjectives

(s)inaugural, initiative, initiatory, first, maidenserving to set in motion“the magazine's inaugural issue”, “the initiative phase in the negotiations”, “an initiatory step toward a treaty”, “his first (or maiden) speech in Congress”, “the liner's maiden voyage”