Where does “measurably” come from?

Measurably derives from English measurable plus the Middle English adverbial suffix -ly, which comes from Old English -līċ, from Proto-Germanic -līkaz meaning "like" or "having the form of," ultimately from Proto-Indo-European roots meaning "to lie down" and "together."

measurably (English): In a measurable manner; To a measurable extent

Definitions

In a measurable manner; To a measurable extent

Ancestry of “measurably”, step by step

Step	Language	Word	Meaning
1	English	measurable	Able to be measured; Of significant importance;...
2	English	measure	A prescribed quantity or extent; The act or...
3	Middle English	mesure	—
4	Old French	mesure	—
5	Latin	mēnsūra	measure; a measuring
6	Latin	mētior	to measure or estimate
7	Proto-Indo-European	meh₁-	to measure

Every word from Proto-Indo-European meh₁- →Every word from Latin mētior →Every word from Latin mēnsūra →