8 letters · 13 points in Scrabble
noun something that is likely to vary; something that is subject to variation
noun a quantity that can assume any of a set of values
noun a star that varies noticeably in brightness
originBorrowed into Middle English in the 14th century from Old French variable, from Latin variare (“to change”), from varius (“different, various”). Equates to English vary + -able.
Etymology from Wiktionary, CC BY-SA 3.0