a suffix of nouns denoting action or process, change, state or condition, etc., and corresponding to verbs ending in -esce or adjectives ending in -escent: convalescence; luminescence.
A Long List of Affixes: Suffixes, Prefixes, and Combining Forms
Suffixes -able, -ible, -ile: (form adjs) able to, fit to, worthy, capable; apt to; subject to being ~-ed -ac: one affect with -ac, -al, -ane, -ar, -ary, -ch, -ese, -ic, -ical, -id, -ile, -ine, -ish, -ory: like, of, pertaining to; characterized by -aceae: families of plants -aceous, -ous: resemblance to a substance; full of -acy, -age, -ance, -ancy, -asm, -dom, -ence, -ency, -hood, -ism, -ity, -ment, -mony, -ness, -ry, -ship, …
Origin of -escence
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
word-forming element meaning "process or state of being," from Latin -escentia, from -escentem (see -escent).
Online Etymology Dictionary, © 2010 Douglas Harper