EXTENSIONAL Meaning of EXTENSIONAL in English [ex.ten.sion.al] adj (1647) 1: of, relating to, or marked by extension; specif: denotative 2: concerned with objective reality -- ex.ten.sion.al.i.ty n -- ex.ten.sion.al.ly adv Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012