A person who, or thing that, interferes.

(literary theory) A psychological conflict that is internal to a character. / (by extension) Mental struggle arising from competing feelings, desires, impulses, etc.

(botany) A meristem found as a "slice" within an organ and allowing lengthening in a middle position.

(military, astronautics) A class of long-range missiles associated especially with carrying nuclear warheads.

(mathematics, topology) A point in a set S that has a neighbourhood which is contained in S.

(computing) command line interface

plural of interior point

(euphemistic, archaic) Pregnancy

(physics) The fundamental interaction responsible for the weak nuclear force.

(physics) A unified description of electromagnetic interaction and weak nuclear interaction.