The quality or state of being obsolete or no longer in use. / (biology) The quality of being imperfectly or indistinctly developed.

plural of obsoleteness

(of words, equipment, etc.) No longer in use; gone into disuse; disused or neglected (often in favour of something newer). / (biology) Imperfectly developed; not very distinct.

(transitive, US) To cause to become obsolete.

simple past tense and past participle of obsolete

present participle of obsolete

Third-person singular simple present indicative form of obsolete

Obsolescence.

When out of date or no longer in use. / (biology) Imperfectly or indistinctly developed.

plural of obsoletism