matter (nom)
Sens 1 : a subject (as a fact, an event or course of events, or a circumstance,
situation, or question) of interest or relevance : an object of thought or consideration. [source : MWU]
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Sens 2 : a matter of (idiom): a circumstance which involves or entails a specified action, choice, etc.,
or in regard to which a specified quality or personal attribute is at stake; a case or question of. [source : OED]
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Sens 3 : trouble or difficulty. [source : AHD]
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Sens 1 : to be of importance. [source : AHD]