say it: suhb-STAN-chee-ayt
substantiate is a verb meaning "establish or strengthen as with new evidence or facts". It carries 4 recorded senses.
represent in bodily form
“He embodies all that is evil wrong with the system”
“The painting substantiates the feelings of the artist”
solidify, firm, or strengthen
“The president's trip will substantiate good relations with the former enemy country”
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 substantiate 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.