say it: mag-nuh-fuh-KAY-shuhn
magnification is a noun meaning "the act of expanding something in apparent size". It carries 4 recorded senses.
the act of expanding something in apparent size
the ratio of the size of an image to the size of the object
making to seem more important than it really is
a photographic print that has been enlarged
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for magnification come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.