"Complement" is a word in ENGLISH

A compliment.

That which fills up or completes; the quantity or
number required to fill a thing or make it complete.

Full quantity, number, or amount; a complete set;
completeness.

The interval wanting to complete the octave; -- the
fourth is the complement of the fifth, the sixth of the third.

That which is required to supply a deficiency, or to
complete a symmetrical whole.

Something added for ornamentation; an accessory.

The whole working force of a vessel.

A second quantity added to a given quantity to make
it equal to a third given quantity.

To compliment.

To supply a lack; to supplement.