Definitions

1. adjective

known or existing; having a fact or piece of information

“The weather forecast is certain to be accurate for the next few days.”

2. adverb

without doubt or uncertainty; certainly

“She is certain to pass the exam if she studies hard.”

3. noun

a fact or piece of information that is known or can be determined

“The certainty of the test results was reassuring.”

4. noun

the state of being sure or confident

“The team’s certainty about their chances of winning gave them an edge.”