1
: the quality or state of being compatible : the capacity of two or more entities to combine or remain together without undesirable aftereffects : mutual tolerance : congruity
the compatibility of blood types compatibility between church and state
2
a
: the capability of cross-fertilizing freely
—used chiefly of plants and plant parts
b
: the capability of components (as of an electronic system) to function together
specifically
: the ability of a color television transmission system to provide black-and-white service for monochrome receivers without special modification
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Merriam-Webster unabridged
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