Diction can be pictured as a word on its way out of a person. Latin dictio means a saying, a word. Hold that moment and you can look at it two ways: how the word is shaped as it leaves the mouth, and which word was picked to leave in the first place. English uses one name for both, because both are about the word as an act of somebody's, not as an item in a list.
From the word’s history
Wiktionary traces diction to Latin dictio, 'a saying, speaking, uttering', from dico 'to say', and notes that the modern senses of word choice and clarity grew on top of the older sense 'a word or phrase'.
Wiktionary 記載 diction 來自拉丁文 dictiō（說、話語），字根 dīcō 是「說」；它也指出「用字選擇」和「口齒清晰」這兩個現代意思，是後來從「一個字、一句話」那個舊義長出來的。
Wiktionary entry 'diction' (kaikki:3f6f69a190036ae4:185691651), supplied in the evidence packet.
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