(nautical) Alternative form of close-hauled

(nautical, of a sail) Having all the reefs taken in.

(programming, object-oriented programming) A principle that states that software entities (such as classes, modules, and functions) should be open for extension, but closed for modification.

(sports) The time of year when no competition takes place. / (hunting, fishing) The time of year when hunting or fishing is not permitted.

The ordered arrangement of objects such as to create the greatest density (e.g. of atoms in a crystal).

plural of close season

(seduction community) To end a pickup of a woman by getting her telephone number.

(seduction community) The successful acquisition of a woman's telephone number at the end of a pickup attempt.

(algebra, field theory, of a field F) A field G such that every polynomial over F splits completely over G (i.e., every element of G is a root of some polynomial over F and every root of every polynomial over F is an element of G).

(nautical, obsolete) close quarters