obsolescent


From The Collaborative International Dictionary of English v.0.48:

Obsolescent \Ob`so*les"cent\, a. [L. obsolescens, -entis, p. pr.
   of obsolescere, to wear out gradually, to fall into disuse;
   ob (see Ob-) + solere to use, be wont.]
   Going out of use; becoming obsolete; passing into desuetude.
   [1913 Webster]
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