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: in an extemporaneous manner
ad hoc, ad-lib, extemporaneous, extemporary, impromptu, improvisational, improvised, off-the-cuff, offhand, offhanded, snap, spur-of-the-moment, unconsidered, unplanned, unpremeditated, unprepared, unrehearsed, unstudied
considered, planned, premeditated, premeditative, prepared, rehearsed
circa 1553, in the meaning defined above
Latin ex tempore, from ex + tempore, ablative of tempus time
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occurring twice a year or every two years
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