OBSOLESCENT
Source: 566, 567
obsolescent. Obsolescent, a. growing obsolete
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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.