01 conj. Upon any less condition than (the fact or thing stated in the sentence or clause which follows); if not; supposing that not; if it be not; …
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Upon any less condition than (the fact or thing stated in the sentence or clause which follows); if not; supposing that not; if it be not; were it not that; except; as, we shall fail unless we are industrious.“Here nothing breeds unless the nightly owl.” — Shak.