"counting backward from an arbitrary number to indicate the time remaining before some event (such as launching a space vehicle)"@en-us . "counting backward from an arbitrary number to indicate the time remaining before some event (such as launching a space vehicle)"@en-us . . "100616549"@en-us . . "0"^^ . . . . "countdown"@en-us . "00653518-n"^^ . . . . "0.0949995"^^ . "0.119101"^^ . "countdown"^^ . . "0.193613"^^ . "100427174"@en-us . . "0"^^ . . . "0.288653"^^ . . . . "0.141019"^^ . "0.0569843"^^ . "100653518"^^ . "0.0584409"^^ . "0.0471887"^^ .