Meaning

noun all the people living at the same time or of approximately the same age

noun group of genetically related organisms constituting a single step in the line of descent

noun the normal time between successive generations

originInherited from Middle English generacioun, from Anglo-Norman generacioun, Middle French generacion, and their source, Latin generātiō, from generāre (“to beget, generate”). By surface analysis, generate + -ion.

Etymology from Wiktionary, CC BY-SA 3.0