say it: suhb-stan-chee-AY-shuhn
substantiation is a noun meaning "additional proof that something that was believed (some fact or hypothesis or theory) is correct". It carries 2 recorded senses.
additional proof that something that was believed (some fact or hypothesis or theory) is correct
“fossils provided further confirmation of the evolutionary theory”
the act of validating; finding or testing the truth of something
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 substantiation 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.