Definition of "emphasis"

Special weight or forcefulness given to something considered important.  examples

Special attention or prominence given to something.  examples

Prominence given to a syllable or words, by raising the voice or printing in italic or underlined type.  examples

(phonology) The phonetic or phonological feature that distinguishes emphatic consonants from other consonants.

(typography) The use of boldface, italics, or other such formatting to highlight text.  examples