1540s, "a word;" 1580s, "expression of ideas in words," from Late Latin dictionem (nominative dictio) "a saying, expression, word," noun of action from dic-, past partici [..]

The choice of a particular word as opposed to others. A writer could call a rock formation by many words--a stone, a boulder, an outcropping, a pile of rocks, a cairn, a mound, or even an "anomal [..]

choice of words, style, mode of expression

The selection of words in a literary work. A work's diction forms one of its centrally important literary elements, as writers use words to convey action, reveal character, imply attitudes, identify themes, and suggest values. We can speak of the diction particular to a character, as in Iago's and Desdemona's very different ways of s [..]

choice of words. Diction is often described as either informal or colloquial if it resembles everyday speech, or as formal if it is instead lofty, impersonal, and dignified. Tone is determined largely [..]

or lexis, or vocabulary of a passage refers to nothing more or less then its words. The words of a given passage might be drawn from one register, they might be drawn from one linguistic origin (e.g. [..]

The social position (the sociolect or idiolect) indicated by the choice of words for the poem.

The selection of words in a particular literary work, or the language appropriate for a particular (usually poetic) work. The term poetic diction refers to the appropriate selection of words in a poem [..]

 – the way words are written or spoken such an formal or informal

An author’s word choices.

(n) the articulation of speech regarded from the point of view of its intelligibility to the audience(n) the manner in which something is expressed in words

Clear articulation of words in speaking and singing through effective pronunciation of vowels and consonants.

the choice of words, especially with regard to correctness, clearness, or effectiveness, in a literary work. Writers will use words to reveal character, imply certain attitudes, convey action, demonst [..]

The effectiveness and degree of clarity of word choice and expression.

Generally speaking, diction is just word choice. Which words is the author using, and what's their effect? Should you call your crush "sweetie," "dearest," "darling," [..]