Emphatic means forceful and clear. Nicole's mother was emphatic when she told her not to come home late again.
When something is emphatic, it imparts emphasis. A sentence is made emphatic by adding an exclamation point, and the word carries with it the important and urgent feeling of that punctuation mark. If a baseball team defeats another by 10 runs, the victory is emphatic because like strong speech, the victory is clear and forceful.