|Definition - Words that shares the same ancestor.|
Example - Some Indo-European cognates of the English word night are (all of them derive from the Proto-Indo-European *nokt, night):
nox (Latin), and
Etymology - The word derives from the Latin com, together + gnatus, born.
Oxford English Dictionary - Its first citation in this sense is from 1827:
"A cognate language."
(G. Higgins Celtic Druids 61)