• synonyms

ad kalendas Graecas

[ahd kah-len-dahs grahy-kahs; English ad kuh-len-duh s gree-kuh s]
adverb Latin.
  1. at no time; never: from the fact that the Greeks did not reckon dates by calends.
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Origin of ad kalendas Graecas

literally, at the Greek calends
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018