In 1843, the comparative anatomist Richard Owen (1804-1892) introduced the term into evolutionary biology as he did with homology. It means similarity in function, but not structure, due to convergent evolution. Thus, while the wings of birds and bats do not stem from a common ancestor, they evolved conversantly to have the same function (viz., flight) based on different structures (viz., a bird’s wing consists of feathers as against skin in the case of a bat).
See Analogy (as a trope), Comparative method, Convergent evolution, Homology