(1) Of, being, or pertaining to the same taxonomic genus as another.
(2) Having the same function (used of muscle that are synergistic).
(3) Having similar composition, structure, or antagonistic effect(s) as another.
(4) Having been derived from the same source or stock.
In biology, congeners refer to organisms of the same taxonomic genus (as conspecifics pertain to organisms of the same species).
Word origin: congener, from Latin roots meaning “born together” or “within the same race or kind”