Definition of once:

part of speech: noun

A species of wild- cat- see ounce.

part of speech: noun

One time; the same time; at once, at the same point of time; immediately; once and again, at repeated times; repeatedly.

part of speech: adverb

One time, but no more; a single time; all at one time; formerly.

Usage examples:

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A hollow place or ditch round a fortified place, commonly filled with water; a kind of cavity in a bone. ...