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1. The act of graduating, or the state of being graduated; as, graduation of a scale; graduation at a college; graduation in colour; graduation by evaporation; the graduation of a birds tail, etc.

2. The marks on an instrument or vessel to indicate degrees or quantity; a scale.

3. The exposure of a liquid in large surfaces to the air, so as to hasten its evaporation.

Origin: LL. Graduatio promotion to a degree: cf. F. Graduation division into degrees.