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say it: THOW-zuhndth
thousandth is a noun and adjective meaning "position 1,000 in a countable series of things". It carries 3 recorded senses.
position 1,000 in a countable series of things
one part in a thousand equal parts
the ordinal number of one thousand in counting order
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 thousandth 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.