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The Collaborative International Dictionary
Approximativeness

Approximative \Ap*prox"i*ma*tive\, a. [Cf. F. approximatif.] Approaching; approximate. -- Ap*prox"i*ma*tive*ly, adv. -- Ap*prox"i*ma*tive*ness, n.

Wiktionary
approximativeness

n. The state or quality of being approximative.