Knowledge; the state of knowing.
"The sheer volume of data made it impossible for any single person to have knowledge of every detail in the project."
In plain English: Knowing as a noun is the information or facts that you have learned and remember.
"She has a good sense of know regarding the local customs."
Usage: Do not use "know" as a noun to mean knowledge, because it is strictly a verb. Instead, use the noun form "knowledge" when referring to the state or fact of knowing something.
know how to do or perform something
"She knows how to knit"
"Does your husband know how to cook?"
be aware of the truth of something; have a belief or faith in something; regard as true beyond any doubt
"I know that I left the key on the table"
"Galileo knew that the earth moves around the sun"
be familiar or acquainted with a person or an object
"She doesn't know this composer"
"Do you know my sister?"
"We know this movie"
"I know him under a different name"
"This flower is known as a Peruvian Lily"
have firsthand knowledge of states, situations, emotions, or sensations
"I know the feeling!"
"have you ever known hunger?"
"I have lived a kind of hell when I was a drug addict"
"The holocaust survivors have lived a nightmare"
"I lived through two divorces"
accept (someone) to be what is claimed or accept his power and authority
"The Crown Prince was acknowledged as the true heir to the throne"
"We do not recognize your gods"
have fixed in the mind
"I know Latin"
"This student knows her irregular verbs"
"Do you know the poem well enough to recite it?"
have sexual intercourse with
"This student sleeps with everyone in her dorm"
"Adam knew Eve"
"Were you ever intimate with this man?"
To perceive the truth or factuality of; to be certain of or that.
"After checking the bank statement, I finally know for sure that my account was hacked last night."
In plain English: To know means to have information or understanding about something because you have learned it or experienced it yourself.
"I know my best friend very well."
Usage: Use "know" when you are certain of a fact or have direct personal experience with something, such as knowing the answer to a question. Avoid using it for temporary guesses or beliefs, which should instead be expressed with words like "think" or "believe."
The word "know" comes from Old English cnāwan, which originally meant to perceive or recognize. It traveled into modern English through Middle English while retaining its core meaning of having knowledge or awareness.