(archaic) instability; unstableness

(music) an instrument that produces a concert pitch of F when a C is written in the music

(music) an instrument that produces the concert pitch of E♭ when a C is written in the music

(music) an instrument that either does not transpose, or transposes by an octave or multiple octaves.

(music) an instrument that produces a concert pitch of B♭ when a C is written in the music

plural of instance variable

(software, object-oriented programming) A member variable that is associated with a class for which each object of the class has a separate copy.

Alternative spelling of preinstructional

(computing) An assembly language instruction that uses only absolute addresses.

(business, banking, finance) An institution, such as a bank, insurance company or fund, that provides financial services for its clients or members.