9 letters · 14 points in Scrabble
noun the cardinal number that is the sum of six and one
originFrom Middle English septenarie, septenary, from Classical Latin septēnārius (“consisting of seven each”), from septēnus (“seven each; seven at a time”) + -ārius (whence the English suffix -ary). With use as noun compare septēnārius (“line of seven feet; unit of seven parts; period of seven years”). By surface analysis, septen- + -ary. Doublet of septenar and septenarius.
Etymology from Wiktionary, CC BY-SA 3.0