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1. the cardinal number that is the sum of three and one
2. a numeral, 4, IV, etc., representing this number
3. something representing, represented by, or consisting of four units, such as a playing card with four symbols on it
4. Cricket
a. a shot that crosses the boundary after hitting the ground
b. the four runs scored for such a shot
5. Rowing
a. a racing shell propelled by four oarsmen pulling one oar each, with or without a cox
b. the crew of such a shell

What does it mean when you dream about the number four?

Four is the number of stability, upon which all is based: the four sides to the square; the four seasons; the four directions; the four elements; and, the four mental functions (thought, feeling, sense, and intuition).

References in classic literature ?
Finally, Farmer Louis sold them eighty trusses, making in all four hundred and thirty.
He was cautioned not to let a bit of straw out of his hands under a louis the truss, and they intrusted to him straw to the amount of four hundred and thirty louis.
Well, we shall find their muskets, their cartridges, and their flasks; and instead of four musketoons and twelve balls, we shall have fifteen guns and a hundred charges to fire.
SOCRATES: Four times four are sixteen--are they not?
He sent at once for the fisherman, and when he came said to him, "Fisherman, bring me four more fish like you have brought already, for an accident has happened to them so that they cannot be served up to the Sultan.
Heidegger imputed to it, could not have been bestowed on four human beings who needed it more wofully.
By the mercy of the devil," retorted Joannes Frollo, "these four hours and more; and I hope that they will be reckoned to my credit in purgatory.
Ferguson carefully noted the fact, that he had stopped at four degrees north latitude and seventeen degrees west longitude.
Edmund Burton, hosier, in Newgate-street, with whom I received four hundred pounds for a portion.
Well, I do not mind telling you I have been at work upon this geometry of Four Dimensions for some time.
I remember the remains of one upon an island in a small lake near Lerwick, which at high tide communicates with the sea, the access to which is very ingenious, by means of a causeway or dike, about three or four inches under the surface of the water.
the individual husbandman, for example, producing for four, and labouring four times as long and as much as he need in the provision of food with which he supplies others as well as himself; or will he have nothing to do with others and not be at the trouble of producing for them, but provide for himself alone a fourth of the food in a fourth of the time, and in the remaining three-fourths of his time be employed in making a house or a coat or a pair of shoes, having no partnership with others, but supplying himself all his own wants?