1 out of use or practice; not current
2 out of date; unfashionable or outmoded
3 (Biology) (of parts, organs, etc.) vestigial; rudimentary
(C16: from Latin obsoletus worn out, past participle of obsolere (unattested), from ob- opposite to + solere to be used)
The word obsoleteness is hardly ever used, obsolescence standing as the noun form for both obsolete and obsolescent
English Collins Dictionary - English Definition & Thesaurus
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"Collins English Dictionary 5th Edition first published in 2000 © HarperCollins Publishers 1979, 1986, 1991, 1994, 1998, 2000 and Collins A-Z Thesaurus 1st edition first published in 1995 © HarperCollins Publishers 1995"