Etymology

tardis

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Today it means: Something which resembles such a machine, either in that it travels through time or in that its interior is or appears to be larger (or more full of information or things) than its exterior suggested. Full definition →

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TARDIS · proper noun, noun1

Coined in 1963 for the British science-fiction programme Doctor Who; said to stand for "Time and Relative Dimension(s) in Space".

Tardis · proper noun, noun2

From TARDIS, the designation of the bigger-on-the-inside time machine used in the British science-fiction TV series Doctor Who, said in the 1963 story "An Unearthly Child" to be an abbreviation for "Time And Relative Dimension(s) In Space"..

Etymology from Wiktionary, CC BY-SA 4.0.