Diction is the way you talk, that is, the way you enunciate or pronounce your words, and the words and phrases you choose to use.

If you've seen the musical "My Fair Lady," you know the character Eliza Doolittle struggles with her diction as her mentor tries to teach her to become a lady. Because of her accent, she has the most difficult time properly pronouncing even the most simple phrases, but in the end, she succeeds in saying things like the key phrase, "The rain in Spain stays mainly in the plain."

Definitions of diction

n the manner in which something is expressed in words

choice of words, phraseology, phrasing, verbiage, wording
mot juste
the appropriate word or expression
verbalisation, verbalization
the words that are spoken in the activity of verbalization
Type of:
expression, formulation
the style of expressing yourself

n the articulation of speech regarded from the point of view of its intelligibility to the audience

indistinct enunciation
Type of:
the aspect of pronunciation that involves bringing articulatory organs together so as to shape the sounds of speech

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