Definitions
1.verb(physical) To remove a gap.
2.verb(social) To finish, to terminate.
3.verbTo come or gather around; to enclose; to encompass; to confine.
4.verbTo have a vector sum of 0; that is, to form a closed polygon.
5.adjectiveSealed, made inaccessible or impassable; not open.
6.adjective(of a store or business) Not operating or conducting trade.
7.adjectiveNot public."closed source a closed committee"
8.adjective(of a set) Having an open complement.
9.adjective(of a set) Such that its image under the specified operation is contained in it."The set of integers is closed under addition: \forall x,y\in\mathbb{Z}\,x+y\in\mathbb{Z}."
10.adjective(of a formula) Lacking a free variable.
11.adjective(of a walk) Whose first and last vertices are the same, forming a closed loop.
12.adjectiveFormed by closing the mouth and nose passages completely, like the consonants /t/, /d/ and /p/.
13.adjectiveHaving the sound cut off sharply by a following consonant, like the /ɪ/ in pin.