Meanings of become defunct in English

My understanding was that if it was not served within a year it would become defunct.

Old school work values like working hard, doing what you're told without questioning and fitting-in have become defunct.

The committee of which Charnchai was a member has since become defunct as part of the military government's plan to restore democracy.

A few years earlier, Uzvadd, reincarnated as Novo Uzvadd and Novo Prakash, had become defunct after its editor Evagrio Jorge learnt a few bitter truths.

And the feast of pikes dances itself off and becomes defunct.

Some sources say the LME must change with the times or risk becoming defunct.

It's only a matter of time before the three-pedal car becomes defunct, writes Kyle Fortune.