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infinitesimal

/ˌɪnfɪnɪˈtɛsɪməl/ adjective C2
  1. Incalculably, exceedingly, or immeasurably minute; vanishingly small. · Do you ever get the feeling that you are but an infinitesimal speck, swallowed by the vastness of the universe and beyond?
  2. Of or pertaining to non-zero quantities whose magnitude is less than any positive rational number.
  3. Very small. (informal)
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Words, meanings, pronunciations and translations from Wiktionary (CC BY-SA 4.0); how common each word is from wordfreq. Made into this dictionary by FluentPlex.