ETYMOLOGY
from Latin maximus (greatest) + -ious
EXAMPLE
“…The pointment kept, and Skelton, seying the sumptuous coste, more pertaynyng for an emperoure or a maxymyous kynge, then for suche a man as he was (although cardynals wyll compare wyth kyngs)…”
From: Merie Tales of Skelton, 1567
Lexicophilia 