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English Dictionary - With Multi-Lingual Search Definitions light speed noun  (astronomy) The speed it takes electromagnetic radiation to transverse a medium. Approximately 299,792.5 kilometers per second in a vacuum.        Find:   Words Starting With:   Words Ending With:   Words Containing:   Words That Match:    Translate Into:    Dutch   French   German    Italian   Spanish     Show 51015202550 results per page. Enter your search terms Submit search form   Web www.allwords.com Browse the Dictionary A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

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