in appropriate contexts: examples of how it's used in a sentence. You can't just give a definition; words aren't islands. They are a part of a bigger whole, the sentence they sit in. The words around it can alter its meaning. That's why an example sentence, "an appropriate context", is important.
in typical grammatical structures: examples of how it's used as an adjective, a noun, a verb, an idiom,and so on. A word can have more than one function. To be able to understand how to use a word properly, you need to know its different forms.
with words that are normally associated with the words defined: examples of its synonyms and antonyms. One of the best ways to learn vocabulary is word association. The more you know about a word, the better able you are to generate and build language that expresses what you want to say, not what you think you should say.