1. Formal: something that, or someone who, survives or remains or is left over after the loss of others; a relic.
2. Archaic: the surviving member of a married couple after one or the other has died; a widow or widower.
3. Biology/Ecology: a species, organism or ecosystem which has survived from a previous age: one which was once widespread but which is now found only in a few areas.
4. Geology: structure or other feature which has survived from a previous age.
5. Linguistics: a survival of an archaic word, language or other form.
6. surviving; remaining.
Etymology: from Latin relictus, past participle of relinquō, “I leave behind, abandon, relinquish”, from re- “again”+ linquō, “I leave, quit, forsake, depart from”.