9 letters · 15 points in Scrabble
adjective one thing at a time
adverb a little bit at a time
originFrom Middle English pecemele, from pece (“piece”) + mele (from Old English mǣlum (“at a time”), dative plural form of mǣl (“time, measure”), taking the place of Old English styċċemǣlum (“in pieces, bit by bit, piecemeal; to pieces, to bits; here and there, in different places; little by little, by degrees, gradually”); equivalent to piece + -meal.
Etymology from Wiktionary, CC BY-SA 3.0