What does the word cognitive mean?

of, relating to, being, or involving conscious intellectual activity (such as thinking, reasoning, or remembering)

It means thinking and reasoning and remembering . Here is the word in a example sentence .

Frequency: The definition of cognition is the mental process of thinking and understanding and the understanding that comes from this mental process

An example of cognition is the thought process you undergo when you learn how to do a new math problem for the first time.