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Noun approximation has 4 senses
estimate, estimation, approximation, idea - an approximate calculation of quantity or degree or worth; "an estimate of what it would cost"; "a rough idea how long it would take"--1 is a kind of calculation, computation, figuring, reckoning
 --1 has particulars:
 |  | guess, guesswork, guessing, shot, dead reckoning; guesstimate, guestimate; overestimate, overestimation, overrating, overreckoning; underestimate, underestimation, underrating, underreckoning | 
approximation - the quality of coming near to identity (especially close in quantity)--2 is a kind of similarity
 
 approximation - an imprecise or incomplete account; "newspapers gave only an approximation of the actual events"--3 is a kind of version
 
 approximation, bringing close together - the act of bringing near or bringing together especially the cut edges of tissue--4 is a kind of joining, connection, connexion
 
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