7 letters · 10 points in Scrabble
adjective divisible by two
adjective equal in degree or extent or amount; or equally matched or balanced
adjective being level or straight or regular and without variation as e.g. in shape or texture; or being in the same plane or at the same height as something else (i.e. even with)
origineven + -est
Etymology from Wiktionary, CC BY-SA 3.0