"initiative" in the noun sense

1. enterprise, enterprisingness, initiative, go-ahead

readiness to embark on bold new ventures

2. first step, initiative, opening move, opening

the first of a series of actions

"initiative" in the adjective sense

1. inaugural, initiative, initiatory, first, maiden

serving 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"

Source: WordNet® (An amazing lexical database of English)

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