WordNet (r) 3.0 (2006):

more or less
    adv 1: (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, more or
           less, around, or so]
    2: to a small degree or extent; "his arguments were somewhat
       self-contradictory"; "the children argued because one slice
       of cake was slightly larger than the other" [syn: slightly,
       somewhat, more or less]

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