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Definition of opening : 1. A place which is open; a breach; an aperture; a gap; cleft, or hole.
2. A thinly wooded space, without undergrowth, in the midst of a forest; as, oak openings.
3. Hence: A vacant place; an opportunity; as, an opening for business.
4. of Open
5. The act or process of opening; a beginning; commencement; first appearance; as, the opening of a speech.

Synonyms:

source, interruption, arising, chess opening, fount, col, luck, kickoff, outlet, outset, initiation, commencement, onset, coal scuttle, leadoff, starting, chance, scuttle, first, origination, dawn, start, theory, opening move, spring, hatchway, launch, incipience, curtain raising, inception, enterprisingness, possible action, crack, maiden, genesis, porta, enterprise, beginning, introductory, inaugural, occasion, inauguration, primary, break, birth, fountain, vent, nascence, origin, rise, opening night, initiative, nascency, initiatory, opportunity, go-ahead, possibility, hypothesis, shot, incipiency, open, possibleness, spread, disruption, first step

entrance (part of speech: noun)

ingress, entrance, input, intake, door, entryway, aperture, access

opening (part of speech: verb)

mouth, chasm, pore, revealing, releasing, exposing, gate, disclosing, uncorking, gap, embouchure, orifice, unlocking, inlet, unplugging, yawning, undoing, unsealing, hatch, hole, portal, baring

introduction (part of speech: noun)

overture, preamble, introduction, forward, preface, prologue, prelude

Usage examples: