1.AdjectiveConcerning things that are so minor as to be negligible, trivial, or trifling. Often used to describe exemptions in government rules and regulations.
"The tax is not payable on amounts below the de minimis limit of £100 per year.; The de minimis rules on import duty mean that alcohol for personal consumption is exempt from any charge."
2.AdjectiveBeneath the notice of the law; so minor as not to warrant a penalty or remedy.
"The behaviour of the accused was technically assault, but the judge found it de minimis and entered an acquittal."