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Tu

1 American  
Symbol,

  1. (formerly) thulium.

Tu. 2 American  

abbreviation

  1. Tuesday.

t.u. 3 American  

abbreviation

  1. trade union.

T.U. 4 American  

abbreviation

  1. toxic unit.

  2. Trade Union.

  3. Training Unit.

TU British  

abbreviation

  1. trade union

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Tu replied, “That may be so, but it is also irrelevant.”

From Slate • Apr. 13, 2026

When traveling with her dog, Tu usually ignores bad behavior and instead regularly rewards good behavior with treats.

From The Wall Street Journal • Mar. 25, 2026

When her best friend got married seven years ago, Tran Tu Linh gave her a gold ring weighing just over 0.1 ounces.

From Barron's • Jan. 30, 2026

Earlier, British top seeds Julian Cash and Lloyd Glasspool suffered a shock second-round defeat by Australian wildcards James McCabe and Li Tu in the men's doubles.

From BBC • Jan. 23, 2026

John Tu was the first to pledge his support.

From "The Freedom Writers Diary" by The Freedom Writers

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.