public meaning
EN
[ˈpʌblɪk] 
US WPublic
- In public relations and communication science, publics are groups of individual people, and the public (a.k.a. the general public) is the totality of such groupings.
- Samuel Mateus 2011's paper "Public as Social Experience" considered to view the concept by an alternative point of view: the public "is neither a simple audience constituted by media consumers nor just a rational-critical agency of a Public Sphere".
- The name "public" originates with the Latin "populus" or "poplicus", and in general denotes some mass population ("the people") in association with some matter of common interest.
FR public 
- NounPLpublicsPREpubli-
- The people in general, regardless of membership of any particular group.
- Members of the public may not proceed beyond this point.
- (archaic) A public house; an inn.
- The people in general, regardless of membership of any particular group.
- AdjectiveCOMmore publicSUPmost public
- Able to be seen or known by everyone; open to general view, happening without concealment.
- Pertaining to all the people as a whole (as opposed a private group); concerning the whole country, community etc.
- Officially representing the community; carried out or funded by the state on behalf of the community.
- From another point of view, it was a place without a soul. The well-to-do had hearts of stone; the rich were brutally bumptious; the Press, the Municipality, all the public men, were ridiculously, vaingloriously self-satisfied.
- Open to all members of a community; especially, provided by national or local authorities and supported by money from taxes.
- (of a company) Traded publicly via a stock market.
- Able to be seen or known by everyone; open to general view, happening without concealment.
- More Examples
- Used in the Middle of Sentence
- Wavy panels made of steel trelliswork hang from the entry’s ceiling; big squat columns frame views to a small public garden outside.
- My sister beats me at pool in public a second time. I claim some dignity back by potting two of my balls before Tammy sinks the black.
- Speedboarding involves leaping onto long skateboards and zipping down steep public streets and canyon roads at speeds of more than 40 mph.
- Used in the Beginning of Sentence
- Public confidence in politicians must underpin our democracy.
- Public good nothing, replied the copresidents of the League of Women Voters of Chicago.
- Used in the Ending of Sentence
- I really wish you wouldn't carry on like that in public!
- Good heavens, I can't write down to the level of the vulgar public!
- Used in the Middle of Sentence
Definition of public in English Dictionary
- Part-of-Speech Hierarchy
- Adjectives
- Nouns
- Countable nouns
- Countable nouns
- Adjectives
- fr public
- en publication
- fr publication
- en publicly
- en publicity
Source: Wiktionary
Grammatically, this word "public" is an adjective. It's also a noun, more specifically, a countable noun.