trillionth

/ˈtrɪljənθ/
adjective
  1. Being the ordinal number for one trillion; coming after the 999,999,999,999th.
    • The trillionth digit of pi is a 9.
    • The trillionth visitor to the website won a prize.
    • We are celebrating the trillionth mile driven by our fleet.
  2. Being one of a trillion equal parts of a whole; extremely small.
    • A trillionth of a second is called a picosecond.
    • The machine can measure changes as small as a trillionth of a meter.
    • Only a trillionth of the light from the star reaches Earth.
Antonyms
noun
  1. The person or thing in the trillionth position.
    • The trillionth entry in the database was a test record.
    • The trillionth in line for the giveaway received a special bonus.
    • He was the trillionth customer at the store.
  2. One of a trillion equal parts of something; a tiny fraction.
    • A trillionth of a gram is called a picogram.
    • They detected a trillionth of a mole of the substance.
    • The error was less than a trillionth of the total.
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