A3

¹ British

noun

See also A sizes
1. a standard paper size, 297 × 420 mm
2. ( as adjective )
  
  an A3 book

"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

A3 ² British

abbreviation

text messaging anytime, anywhere, anyplace

"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

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Investors may be overestimating the threat posed by BYD’s newly unveiled Xuanji A3 autonomous-driving chip, they note.

From The Wall Street Journal ● Jun. 1, 2026

When the Hindhead Tunnel opened in 2011 it was said to have "surpassed expectations" by finally removing one of the worst bottlenecks on the A3.

From BBC ● May 31, 2026

The drawings sketched for Attenborough's 99th birthday last year spanned across eight A3 sheets of paper and took Max four days to complete.

From BBC ● May 7, 2026

The facility received an A3 rating from Moody’s, marking the first time a loan backed by high-performance computing infrastructure has achieved investment-grade status.

From Barron's ● Apr. 2, 2026

Equation 19 fixed the longitude position of the satellite at time T. Equation A3 accounted for errors in longitude.

From "Hidden Figures" by Margot Lee Shetterly

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