[1] : WordNet (r) 2.0

more or less
     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" syn: approximately,
           about, close to, just about, some, roughly, around,
            or so
see also:
approximately about close to just about some roughly 
around or so 

[2] : Moby Thesaurus II by Grady Ward, 1.0

29 moby thesaurus words for "more or less":
   about, all but, almost, approximately, approximatively, as good as,
   circa, fairly, for practical purposes, generally,
   generally speaking, in round numbers, just about, kind of,
   moderately, most, nearly, plus ou moins, practically, pretty,
   rather, roughly, roughly speaking, roundly, say, some, something,
   sort of, well-nigh

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