Definitions
1.verbTo relate or belong to; to have reference to or connection with; to affect the interest of; to be of importance to.
2.verbTo engage by feeling or sentiment; to interest."A good prince concerns himself in the happiness of his subjects."
3.verbTo make somebody worried."I’m concerned that she’s becoming an alcoholic."
4.nounThat which one is concerned in; one's business.
5.adjectiveCausing concern; worrisome."it's very concerning that our neighbour seems to be crying very loudly these days"
6.adjectiveImportant.
7.prepositionRegarding, respecting."Physically, everything is perfect, but concerning your mental state, you have some problems."