that which fills up or completes; the quantity or number required to fill a thing or make it complete.-that which is required to supply a deficiency, or to complete a symmetrical whole.-full quantity, number, or amount; a complete set; completeness.-a second quantity added to a given quantity to make it equal to a third given quantity.-something added for ornamentation; an accessory.-the whole working force of a vessel.-the interval wanting to complete the octave; -- the fourth is the complement of the fifth, the sixth of the third.-a compliment.-to supply a lack; to supplement.-to compliment.