411 REFERENCE · Wiktionary
1d
Reference material by Wiktionary contributors. This retains its source identity and is not 411 news reporting.
1D 1-D 1d 1/d
English
Etymology 1
From mul 1 + en d old penny old penny.
Noun
en Britain Ireland historical en 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'.
Etymology 2
Adjective
en one-dimensional.
Alternative forms
en 1-d 1-D 1D