GRE TOEFL infinitesimal Definition Extremely small; tiny, often too small to measure. Example "The chance of winning the lottery is infinitesimal." Sign in to save GRE PDF — $25 TOEFL PDF — $25 ← infinite infinity → Study tips featuring "infinitesimal" TOEFL Academic Vocabulary: Study by Topic Related words GRE awe GRE smithereens GRE abacus SAT abase GRE abash GRE abate GRE abbreviate GRE abbreviation SAT abdicate SAT abdomen GRE abduct GRE aberrant