What does expertize mean?
The word 'expertize' occupies an unusual position in English: although most people encounter it as a variant spelling of the familiar noun 'expertise' — meaning expert skill or specialized knowledge — its older and more distinctive use is as a verb. To expertize something is to act as an expert upon it: to examine, appraise, or render an authoritative judgment, as when a specialist authenticates a painting or assesses a manuscript's value. This verbal sense is comparatively rare and tends to appear in formal, professional settings such as fine-art valuation, insurance assessment, and legal testimony, and it is more characteristic of British than American English. The word derives from 'expert', ultimately from the Latin 'expertus', meaning tried or tested — fittingly, an expert is someone who has been proven through experience. Because the noun form overlaps so heavily with 'expertise', careful writers usually reserve 'expertize' for the verb and choose 'expertise' when they mean the quality of skill itself.
Expert skill or knowledge in a particular field; a variant spelling of 'expertise'.
"Her expertize in medieval manuscripts was widely respected among collectors."
This noun sense is a nonstandard or less common variant; 'expertise' is strongly preferred in careful writing.
To give an expert opinion on or assessment of something, especially by way of authentication or valuation.
"The auction house asked a specialist to expertize the painting before listing it."
Rarely used in the plural, since both the noun variant and the verb are uncommon; the plural applies only to the noun sense.
"The panel drew on the expertizes of several specialists in conservation science."
'Expertize' looks like a typo of 'expertise', but it's actually a real verb — one of the few English words that literally means 'to do what an expert does.'
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of expertize
'Expertize' derives from the adjective and noun 'expert', which entered English via Old French from the Latin 'expertus', the past participle of 'experiri', meaning to try or test. The verb 'expertize' formed from this root in the early nineteenth century with the sense of giving expert judgment or appraisal. It shares its Latin root with words such as 'experience', 'experiment', and 'peril-adjacent 'peritus'-derived terms, all pointing to the idea of knowledge gained through trial. The noun use of 'expertize' arose later as an occasional variant of 'expertise'.
How expertize is actually used
As a verb, 'expertize' is relatively uncommon and leans formal or specialist, appearing most often in contexts like art valuation, authentication, and professional assessment; it is more at home in British usage than American. As a noun, it is generally treated as a variant spelling of the far more common 'expertise', and careful writers typically prefer 'expertise' in that role.
Easily confused with expertize
'Expertise' is the common noun denoting expert skill or knowledge, while 'expertize' is chiefly a verb meaning to give an expert opinion — and is also occasionally used as a nonstandard variant of the noun 'expertise'.