Noun
the local time at the 0 meridian passing through Greenwich, England; it is the same everywhere
Source: WordNetA mariner with a chronometer could check its reading using a lunar determination of Greenwich time. Source: Internet
Howse 1997, p. 114 On 14 May 1880, a letter signed by 'Clerk to Justices' appeared in 'The Times', stating that 'Greenwich time is now kept almost throughout England, but it appears that Greenwich time is not legal time. Source: Internet
This refers to 'standard time' for the several provinces, defining each in relation to 'Greenwich time', but does not use the expression 'Greenwich mean time'. Source: Internet
Then, on the morning of 22 March 1862, between eight and nine o’clock Greenwich Time, another amateur astronomer, a Mr Lummis of Manchester, England, saw a transit. Source: Internet