Final answer:
The definition of evanesce does not match any of the provided options, but it means to disappear or vanish, akin to how an apparition fades away. The word 'apparition' in the poem suggests a fleeting, ephemeral presence or realization, overshadowed by the themes of transience and delicate beauty.
Step-by-step explanation:
The definition of evanesce is to disappear or vanish, much like an apparition or ghost might seem to fade away. This is not one of the options provided in the list. However, based on the context given, it seems the question is exploring literary terms and techniques.
Transfiguration refers to a change in form or appearance, apostrophe is a rhetorical device where a speaker addresses an absent person or personified quality, personification is a figure of speech where human qualities are attributed to nonhuman things, and onomatopoeia is the use of words whose sounds imitate the sounds associated with the objects or actions they refer to.
In the given poem, 'The apparition of these faces in the crowd', the word 'apparition' suggests something appearing unexpectedly or strangely, similar to the fleeting nature of evanesce, which may evoke feelings of sudden realization or the ephemeral quality of life hinted at by the metaphor of faces being like 'petals on a wet, black bough'. This imagery, combined with the figurative language and the concise phrasing, might suggest ephemeral, delicate beauty as well as the transient nature of human life and encounters.