v. i. [ L. obsolescere. See Obsolescent. ] To become obsolescent. [ R. ] Fitzed. Hall. [ 1913 Webster ]
n. [ See Obsolescent. ] The state of becoming obsolete. [ 1913 Webster ]
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 ]