primary weapon

gunner's primary sight (GPS)

officer of primary responsibility

primary (fire) position

primary arm

primary armament

primary burn

primary control surface

primary sector of fire

primary high explosive

primary military occupational specialty (MOS)

primary mission

primary reserve

primary target

primary target line (PTL)

primary trainer

primary position

primary, alternate, contingency, emergency (PACE)

primary level training (PLT)

primary venturi

primary control surfaces

primary defect

primary cause

primary great circle spherical coordinate system

primary rainbow

primary runway

primary VHF radio

primary failure

integration of primary and secondary radar data

primary radar

primary aid to navigation

nuclear weapon; atomic weapon

weapon-counter-weapon pendulum