(finance) A financial instrument that is marketable at close to par under almost all circumstances.

(derogatory slang) A psychiatric hospital, or the psychiatric ward of a hospital.

The systems of formal laws, regulations, and procedures, and informal conventions, customs, and norms, that shape socioeconomic activity and behaviour.

(informal, Internet) To ban without hesitation.

(informal, Internet) An immediate ban.

(music) Any musical wind instrument played by blowing air through a reed, such as the oboe or the clarinet.

(computing) Any of a set of discrete instructions, each with its own binary representation and associated assembly language mnemonic, that a CPU can execute; typically they involve the movement, comparison or manipulation of data.

(computing) The set of machine instructions that a particular CPU can execute; the corresponding set of assembly language mnemonics.

(finance, law) A document evidencing a debt; the debt so evidenced.

plural of instruction set