The property of two or more appearances of being of the selfsame underlying object; sameness as regards self or identity; identity; identicality.

(organic chemistry) Any fatty acid having twelve carbon atoms and one double bond, but especially 2-dodecenoic acid which is a signal molecule produced by Burkholderia cenocepacia

(biochemistry) A multifunctional membrane protein

A diminutive of the female given name Bertha.