Meaning of OR SO

WordNet Dictionary
	Definition:		[adv]  (of quantities) imprecise but fairly close to correct; "lasted approximately an hour"; "in just about a minute"; "he's about 30 years old"; "I've had about all I can stand"; "we meet about once a month"; "some forty people came"; "weighs around a hundred pounds"; "roughly $3,000"; "holds 3 gallons, more or less"; "20 or so people were at the party"
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	Synonyms:		about, approximately, around, close to, just about, more or less, roughly, some