資料來源 : pyDict

荒廢,退化

資料來源 : Webster's Revised Unabridged Dictionary (1913)

Obsolescence \Ob`so*les"cence\, n. [See {Obsolescent}.]
   The state of becoming obsolete.

資料來源 : WordNet®

obsolescence
     n : the process of becoming obsolete; falling into disuse or
         becoming out of date; "a policy of planned obsolescence"