dedication

Dedication entered English between 1350 and 1400 as Middle English dedicacioun, borrowed from Old French dedicacion, meaning the consecration of a church or chapel. That French word in turn came from Latin dēdicātiō, formed from dēdicātus plus the suffix -iōn.

The facts given point to a single starting sense: the formal consecration of a sacred building. No further shift in meaning is recorded in these facts, though the word's later, broader use in English (devotion to a task or person) isn't something the given sources trace.

The word is built from Latin dēdicātus plus -iōn, but no specific English cognate sharing that root is given in the facts.