more or less

1.  Approximately, as in The truck will hold nine yards of dirt, more or less. This usage was first recorded in 1589.
2.  Basically, essentially, as in We more or less agree on the substance of the letter. This usage was first recorded about 1225.

The adverb has one meaning:

Meaning #1: (of quantities) imprecise but fairly close to correct
  Synonyms: approximately, about, close to, just about, some, roughly, around, or so