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Emphatic is not a noun, it is an adjective, a word that describes a noun; for example an emphatic warning, an emphatic statement.
The noun form is emphasis.
She gave an emphatic speech, leaving no doubt about her commitment to the cause.
The verb for on emphatic is empathise.
As in "to empathise with someone".
Emphatic Diaglott was created in 1864.
The root word of "emphatic" is "emphasia," which comes from the Greek word "emphatikos," meaning "emphatic" or "pronounced."