rarity

n 1: noteworthy scarcity [syn: {rareness}, {infrequency}]

2: a rarified quality: "the tenuity of the upper atmosphere"

[syn: {tenuity}, {low density}]

3: something unusual -- perhaps worthy of collecting [syn: {curio},

{curiosity}, {oddity}, {oddment}, {peculiarity}]

arity

The number of {arguments} a {function} or

{operator} takes. In some languages functions may have

variable arity which sometimes means their last or only

argument is actually a list of arguments.

(1997-07-21)