day one

day one

noun, often capitalized D&O

Definition of DAY ONE

: the first day or very beginning of something

Examples of DAY ONE

1. We've known this about the project since Day One.
2. <since day one of this project, we've always insisted that we would create the best product possible without any consideration of cost>

First Known Use of DAY ONE

1971

Related to DAY ONE

Synonyms: alpha, baseline, birth, commencement, dawn, beginning, genesis, get-go (also git-go), inception, incipience, incipiency, kickoff, launch, morning, nascence, nascency, onset, outset, start, threshold

Antonyms: close, conclusion, end, ending, omega

Related Words: drawing board, first base, ground zero, square one; creation, founding, inauguration, initiation, institution, origination; cradle, fountain, fountainhead, germ, origin, root, seedbed, source, spring, well, wellspring; dawning, opening; advent, appearance, arrival, debut (also début), emergence; childhood, infancy, youth

Near Antonyms: cessation, closing, closure, completion, finale, finish, period, stop, termination, windup

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