1d

/D/

noun

1
The British boy band One Direction.
2
(American football) Initialism of first down. [(American football) The first play in a series that has a maximum of four downs.]
3
(British, Ireland, historical) 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').

adjective

1
Abbreviation of one-dimensional. [Having length, but no width, height or depth.]
2
Initialism of one-dimensional. [Having length, but no width, height or depth.]

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