Definitions for obsolesceˌɒb səˈlɛs
Random House Webster's College Dictionary
ob•so•lesceˌɒb səˈlɛs(v.i.)-lesced, -lesc•ing.
to be or become obsolescent.
Origin of obsolesce:
become obsolete, fall into disuse
"This word has not obsolesced, although it is rarely used"
To become obsolete
to become obsolescent