What is the definition of synecdoche?

Synecdoche is indeed correctly defined as a part of an object representing the whole. This literary device involves using a specific part of something to refer to the entire object or concept, which helps create a more vivid or relatable representation. For instance, saying "all hands on deck" uses "hands" to refer to sailors, emphasizing their role in a collective action. This technique allows for a more engaging and imaginative use of language, inviting readers to make connections and visualize the larger picture through its specific elements.

The other definitions presented do not align with synecdoche. Exaggeration for effect describes hyperbole, while the type of irony where the audience knows more than characters pertains to dramatic irony. Lastly, a poetic structure with conflicting ideas refers to a different concept and is not related to synecdoche at all. Thus, the selection of "a part of an object representing the whole" accurately captures the essence of synecdoche.