Any process involved in the carrying out of an immune response by a leukocyte. [ GOC:add http://purl.obolibrary.org/obo/go/references/0000022 https://www.worldcat.org/search?q=bn%3A0781735149 ]
Synonyms: leucocyte mediated immunity leucocyte immune effector process leukocyte immune effector process immune cell effector process immune cell mediated immunity