- The definition of an adage is a saying that has come to be accepted as truth over time.
"The grass is always greener on the other side" is an example of an adage.
Origin: French ; from Classical Latin adagium, adagio ; from ad-, to plush aio, I say ; from an unverified form agyo ; from Indo-European base an unverified form ē-, speak, say
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Origin: French, from Old French, from Latin adagium.