adj, name, noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   Initialism of first down. abbreviation, alt-of, initialism
2. 2
   Abbreviation of one penny (a coin with the value of 1 pence/penny; 1/240th of a pound, in pre-decimalisation currency, never used for 'one new penny'). British, Ireland, abbreviation, alt-of, historical

Adjective

1. 1
   Abbreviation of one-dimensional. abbreviation, alt-of, not-comparable
2. 2
   Initialism of one-dimensional. abbreviation, alt-of, initialism

Proper Noun

1. 1
   The British boy band One Direction.

Etymology

From 1 + d (“old penny”).

Related phrases

boy band

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.