🇬🇧🇨🇳 certainty - 确定性 : English Lesson

Meaning of "certainty" ("确定性"), detailed definition, and a short video lesson below.

Certainty is when you are really sure about something and you feel almost 100% that it will happen or that it is true. It’s the opposite of guessing or wondering. If you say, “I know for sure,” that feeling is called certainty.

Watch and listen to this English flashcard to understand the word in more detail, with an easy example sentence.

There is certainty that if I say, “I’m not tired,” I will fall asleep on the couch in two minutes.

There is certainty that if I wear white pants, ketchup will magically appear from nowhere.

It’s a certainty that if I try to secretly open a snack, the wrapper will sound like a rocket launch.

There is certainty that if the teacher asks a question, my brain will suddenly forget every fact I ever learned.

The only certainty during hide-and-seek is that someone will hide in the same spot as last time and still think it’s genius.

At the closed gate she placed the small key with certainty, feeling certainty in her fingers. The lock turned; certainty glowed like a lamp, certainty walking ahead as the hallway brightened. Her breath stopped, then broke into a laugh. The certainty of him sitting at the table met her — and she sat, calm and whole.

This word is at the C2 level, which means it represents the highest mastery of English. It’s often used in specialized or highly formal contexts and helps you communicate with precision and subtlety, much like a native speaker.

Expanding your English vocabulary is one of the best ways to improve your pronunciation, spelling, and confidence in English. Watch the video above to memorize the word, understand its meaning, and see example sentences in action. Discover related words to grow your vocabulary naturally. Add words to your playlist for stress-free, effective learning—anytime, anywhere! Watch, learn, repeat.