4

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Noun1.4 - the cardinal number that is the sum of three and one4 - the cardinal number that is the sum of three and one
digit, figure - one of the elements that collectively form a system of numeration; "0 and 1 are digits"
Adj.1.4 - being one more than three4 - being one more than three    
cardinal - being or denoting a numerical quantity but not order; "cardinal numbers"