Certainty is a feeling or state of being sure about something.
When we talk about certainty, we usually mean that we have confidence in our opinions, decisions, or facts. For example, if someone asks us what time our flight leaves and we know for sure that it's 8 o'clock, then we can say with certainty that the answer is 8 o'clock. We use words like "definitely", "without a doubt", or "for sure" to show that we're talking about something certain.
The state of being certain.
