When talking about something that you know or learn, you say a piece of knowledge : This is a useful piece of knowledge.

Knowledge is always followed by a singular verb: Expert knowledge is necessary.

✗ Don’t say: He has a lot of technical knowledges. You say: He has a lot of technical knowledge.

Knowledge is an uncountable noun and is not used in the plural.

→ general knowledge, → working knowledge at working 1 (9 ) GRAMMAR: Countable or uncountable? Ministers publicly denied that they had prior knowledge of the attack (=they denied that they knew that it was going to happen ). She acted with the full knowledge of her boss (=her boss knew about her action ). ‘Is it true that she’s leaving the company?’ ‘ Not to my knowledge (=I do not think so ).’ without somebody’s knowledge He was annoyed to find the contract had been signed without his knowledge. To our knowledge, this is the first time it’s happened. to (the best of) somebody’s knowledge (=used to say that someone may not know the true facts ) To the best of my knowledge, the new project will be starting in June. be common/public knowledge (=be known about by everyone ) Their affair is public knowledge. (secure/safe) in the knowledge that Kay smiled, secure in the knowledge that she was right. I had no knowledge of this whatsoever until ‘The Times’ contacted me.

2 INFORMATION when you know about a particular situation or event, or the information you have about it Evans denied all knowledge of the robbery. knowledge about the need to increase knowledge about birth control Register In everyday English, people usually say that someone knows about something rather than has knowledge of/about something: He didn’t know much about American history.

S2 W1 noun 1 KNOW something the information, skills, and understanding that you have gained through learning or experience knowledge of He did not have much knowledge of American history.

Word family noun knowledge the unknown adjective knowing knowledgeable known ≠ unknown verb know adverb knowingly ≠ unknowingly knowledgeably From Longman Dictionary of Contemporary English knowledge knowl‧edge / ˈnɒlɪdʒ $ ˈnɑː- /

Pronunciation dictionary longman