1. (n.) The act of approximating; a drawing, advancing or being near; approach; also, the result of approximating.

2. (n.) An approach to a correct estimate, calculation, or conception, or to a given quantity, quality, etc.

3. (n.) A continual approach or coming nearer to a result; as, to solve an equation by approximation.

4. (n.) A value that is nearly but not exactly correct.

access accession accord accordance addition adjunct advance advent affairs affiliation affinity afflux affluxion agreement alikeness alliance allowance analogy aping appraisal appraisement approach approaching appropinquation appulse assemblage assessment assimilation assize assizement association bond calculation closeness combination coming coming near coming toward community comparability comparison computation confines conformity connectedness connection contiguity contrariety convergence copying correction correspondence dealings deduction determination deviation differentiation disjunction division environs equation estimate estimation evaluation evolution extrapolation filiation flowing toward foreground forthcoming gauging homology identity imitation immediacy immediate foreground imminence imprecision inaccuracy inaccurateness incorrectness inexactitude inexactness instrumentation integration intercourse interpolation intimacy inversion involution junction laxity liaison likeness likening link linkage linking looseness measure measurement measuring mensuration metaphor metric system mimicking multiplication mutual attraction nearing nearness negligence neighborhood nighness notation oncoming parallelism parity practice precinct predictable error probable error propinquity proportion proximation proximity purlieus quantification quantization rapport rating reduction relatedness relation relations relationship resemblance sameness semblance similarity simile similitude simulation standard deviation subtraction survey surveying sympathy telemetering telemetry tie tie-in tolerance transformation triangulation uncorrectness unfactualness union unpreciseness unrigorousness valuation vicinage vicinity