obsolescent
Concise Oxford English Dictionary © 2008 Oxford University Press:
obsolescent /ˌɒbsəˈlɛs(ə)nt/
▶adjective becoming obsolete.
– derivatives
obsolesce verb,
obsolescence noun.
obsolesce verb,
obsolescence noun.
– origin C18: from L. obsolescent-, obsolescere ‘fall into disuse’.
'obsolescent' also found in these Oxford entries:

