Definition of maxim noun from the Oxford Advanced Learner's Dictionary

 

maxim

 noun
noun
BrE BrE//ˈmæksɪm//
 
; NAmE NAmE//ˈmæksɪm//
 
 
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a well-known phrase that expresses something that is usually true or that people think is a rule for sensible behaviour Word Origin late Middle English (denoting an axiom): from French maxime, from medieval Latin (propositio) maxima ‘largest or most important (proposition)’.Extra examples As the old maxim goes, ‘A picture is worth a thousand words’. If you follow a few simple maxims, your business should be a success. The golden rule is to pay attention. The same maxim applies to parenting. There is some truth in the old maxim, ‘You get what you pay for.’
See the Oxford Advanced American Dictionary entry: maxim