A supplement is something added to something else. Nutritional supplements add vitamins and minerals to the ones already included in the food you eat.

If a zombie army wants to increase its ranks but is running out of bodies, it might supplement its troops with mummies. If the zombies put out their manifesto and then realize they left out an important point, they might supplement the manifesto with a press release. That press release could also be referred to as a supplement.

Definitions of supplement

n a supplementary component that improves capability

accessory, add-on, appurtenance
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auto accessory
an accessory for an automobile
computer accessory
an accessory for a computer
a small and often standardized accessory to a larger system
fixings, trimmings
the accessories that normally accompany (something or some activity)
gas fitting
the fitting (pipes or valves or meters) that convey gas from the gas main to the gas fixtures of a building
pipe fitting, pipefitting
fitting consisting of threaded pieces of pipe for joining pipes together
an electrical (or electronic) fitting that is connected to a source of power and equipped to receive an insert
Type of:
component, constituent, element
an artifact that is one of the individual parts of which a composite entity is made up; especially a part that can be separated from or attached to a system

n a quantity added (e.g. to make up for a deficiency)

Type of:
increase, increment
the amount by which something increases

n textual matter that is added onto a publication; usually at the end

addendum, postscript
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supplementary material that is collected and appended at the back of a book
continuation, sequel
a part added to a book or play that continues and extends it
a brief addendum at the end of a newspaper article
a supplement to a will; a testamentary instrument intended to alter an already executed will
Type of:
written works (especially in books or magazines)

v add as a supplement to what seems insufficient

supplement your diet”
vitaminise, vitaminize
add vitamins as a supplement
eke out, fill out
supplement what is thought to be deficient
supplement with leverage
Type of:
make an addition (to); join or combine or unite with others; increase the quality, quantity, size or scope of

v add to the very end

add on, affix, append
attach to
Type of:
cause to be attached

v serve as a supplement to

“Vitamins supplemented his meager diet”
Type of:
be, comprise, constitute, make up, represent
form or compose

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