Definition of: approximation

(ə·prok′sə·mā′shən) noun
1. The act or process of approximating.
2. Math. A result sufficiently exact for a specified purpose. Synonyms: approach, contiguity, likeness, nearness, neighborhood, propinquity, resemblance, similarity. Approximation expresses as near an approach to accuracy and certainty as the conditions in any given case make possible. Resemblance and similarity may be but superficial and apparent; approximation is real. Approach is a relative term, indicating that one has come nearer than before; approximation brings one really near. Nearness, neighborhood, and propinquity are commonly used of place; approximation, of mathematical calculations and abstract reasoning; we speak of approach to the shore, nearness to the town, approximation to the truth. Antonyms: difference, distance, error, remoteness, unlikeness, variation.