Approximately four weeks (4 times 7 days) to a lunar month (synodic month = 29.54 days). Thus the number four is universally an integral part of primitive sacred calendars.

The meaning of FOUR is a number that is one more than three. How to use four in a sentence.

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Four is the second square number (a "square number" is an integer that can be written as the square of some other integer) and the second centered triangular number.

Noun 1. 4 - the cardinal number that is the sum of three and one IV, Little Joe, quadruplet, quartet, quatern, four, quaternion, quaternity, tetrad,...

See the number 4 with objects that sometimes come to life for a fun surprise! This early math video works great as a "Number of the Day" lesson or as an exciting early math activity for …

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