Principal parts of verbs, such as the past tense and past participle (e.g., go → went, gone ).

The most obvious structural element is the . However, strict A-to-Z is nuanced:

So, what is the structure of a standard dictionary? It is a composed of three interoperating systems:

We often take dictionaries for granted, but they are engineering marvels of organization. Here is the anatomy of a standard dictionary entry: