Word of the day, Infinitesimal Our word of the day from The Arbiter is Infinitesimal Meaning of infinitesimal Something extremely small, so tiny that it's almost impossible to measure or calculate. Synonyms of infinitesimal * Minute * Microscopic * Minuscule * Atomic * Imperceptible * Negligible Pronunciation of infinitesimal IN-fi-ni-TESS-i-muhl READ ALSO: Word of the day, Taunt Example from The Arbiter Your whole life is not up to a dock or a speck in the sands of time. Less than infinitesimal. Please share with us a sentence with the word 'Infinitesimal', let's see how well you understand it.