9 letters · 13 points in Scrabble
verb make a mathematical calculation or computation
verb judge to be probable
verb keep an account of
originBorrowed from Latin calculātus, perfect passive participle of calculō (“to reckon, compute, calculate”, originally by means of pebbles) (see -ate (verb-forming suffix)), from calculus (“a pebble”), further from calx (“limestone”, calc- in compounds) + -ulus (forms diminutives).
Etymology from Wiktionary, CC BY-SA 3.0