Origin of Obsolesce
From Latin obsolescere (“to wear out, fall into disuse, grow old, decay"), inceptive of obsolere (“to wear out, decay") (rare), apparently from ob (“before") + solere (“to be wont"); or else from obs-, a form of ob- + olere (“to grow") (compare adolescent).
Latin obsolēscere obsolescent
From American Heritage Dictionary of the English Language, 5th Edition
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