matter meaning
EN
[ˈmætə] [ˈmætɚ] [ˈmæɾɚ] [-ætə(ɹ)] 
US WMatter
- Before the 20th century, the term matter included ordinary matter composed of atoms and excluded other energy phenomena such as light or sound.
- All the objects from everyday life that we can bump into, touch or squeeze are composed of atoms. This atomic matter is in turn made up of interacting subatomic particles—usually a nucleus of protons and neutrons, and a cloud of orbiting electrons.
- Matter commonly exists in four states (or phases): solid, liquid and gas, and plasma. However, advances in experimental techniques have revealed other previously theoretical phases, such as Bose–Einstein condensates and fermionic condensates.
FR matter 
- NounPLmattersSUF-ter
- Substance, material.
- vegetable matter
- printed matter; He always took some reading matter with him on the plane.
- A condition, subject or affair, especially one of concern.
- What's the matter?; state matters
- An approximate amount or extent.
- I stayed for a matter of months.
- (obsolete) The essence; the pith; the embodiment.
- (obsolete) Inducing cause or reason, especially of anything disagreeable or distressing.
- (obsolete) Pus.
- Substance, material.
- VerbSGmattersPRmatteringPT, PPmattered
- (intransitive) To be important.
- The only thing that matters to Jim is being rich.
- Sorry for pouring ketchup on your clean white shirt! - Oh, don't worry, it does not matter.
- (transitive, obsolete outside dialects) To care about, to mind; to find important.
- To form pus or matter, as an abscess; to maturate.
- (intransitive) To be important.
- More Examples
- Used in the Middle of Sentence
- I think it is overstating matters to say that an hour online is spending all night on the computer.
- He worked tirelessly to collect and wind a ball of string eight feet around, and it matters not one whit.
- The subject matter of the text is untranslatably bound up in the local culture.
- Used in the Ending of Sentence
- The General Assembly authorized the Council to take up the matter.
- We hope someday she and her mother will come to terms on the matter.
- You can certainly trust me to keep my lips sealed about the matter.
- Used in the Middle of Sentence
Definition of matter in English Dictionary
- Part-of-Speech Hierarchy
- Nouns
- Countable nouns
- Singularia tantum
- Uncountable nouns
- Uncountable nouns
- Countable nouns
- Verbs
- Intransitive verbs
- Transitive verbs
- Intransitive verbs
- Nouns
- fr matter
- en matters
- en matter-of-fact
- fr mattera
- en mattery
Source: Wiktionary
Grammatically, this word "matter" is a noun, more specifically, a countable noun and a singularia tantum. It's also a verb, more specifically, an intransitive verb and a transitive verb.