adj. & n.
adj. 1 (also super-duper) colloq. (also as int.) exceptional; splendid. 2 Commerce superfine. 3 Commerce (of a measure) superficial, in square (not lineal or solid) measure (120 super ft.; 120 ft. super).
n. colloq. 1 Theatr. a supernumerary actor. 2 a superintendent. 3 superphosphate. 4 an extra, unwanted, or unimportant person; a supernumerary. 5 Commerce superfine cloth or manufacture.
[ abbr. ]