obsolescence

The state or process of becoming obsolete.

In entomology, an obsolete part of a mark, stria, etc.: as, a band with a central obsolescence.

The state of becoming obsolete.

The state of being obsolete—no longer in use; gone into disuse; disused or neglected.

The process of becoming obsolete, outmoded or out of date.

the process of becoming obsolete; falling into disuse or becoming out of date