Final answer:
Dictionary applications allow you to check the meaning of a word instantly.
Step-by-step explanation:
A dictionary is a tool that allows you to instantly check the meaning of a word. There are many dictionary applications available that provide definitions, pronunciations, and examples of word usage. These applications are helpful for quickly understanding the meaning of unfamiliar words or verifying the correct usage of words. For example, the Oxford English Dictionary is a comprehensive resource that shows how words have changed over time, providing historical examples and illustrating the evolution of language.