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four-o’clock
four-on-the-floor
four-poster
four-star
four-stroke
four-twenty
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Fourier analysis
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fourth dimension
fourth di·men·sion


noun 
Definition:
 
time in relativity theory: time in relativity theory modified mathematically and used in combination with the usual three spatial dimensions to specify the location in space and time of events

fourth-di·men·sion·al adjective
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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