Definitions
There are 2 meanings of the phrase
Key Word.
Key Word - as a noun
A word that is used as a pattern to decode an encrypted message
A significant word used in indexing or cataloging
Example Sentences
"The key word in this sentence is 'example'."
"You need to find the key word in the paragraph before answering the question."
"The key word for this lesson is 'vocabulary'."
"She highlighted the key word in her notes to remember it later."
"Please underline the key words in the text."