certain

/'sə:tn/
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certain

She is certain that she locked the front door.

Definition
  1. Adjective:
    • Established beyond doubt; known for sure: Used to describe something that is definitely true or will definitely happen, leaving no room for uncertainty.
    • Confident and assured; having no doubt: Describes a person's state of mind when they are completely convinced about something.
    • Definite but unspecified; particular but not named: Used to refer to a specific person, thing, or amount without giving precise details or identifying it exactly.
    • Reliable; sure in effect: Describes something that is dependable and will produce the expected result.
Examples of Usage
  • Adjective:
    • It is certain that the sun will rise tomorrow. (Established fact)
    • She was certain she had locked the door before leaving. (Confident and assured)
    • A certain person called for you while you were out. (Definite but unspecified)
    • This medicine is a certain cure for headaches. (Reliable in effect)
Advanced Usage
  • For certain: Used as an adverbial phrase meaning "without doubt; definitely."
    • I can't say for certain when I will arrive.
  • Make certain: To ensure or verify that something is true or will happen.
    • Please make certain all the windows are closed.
Variants and Related Words
  • Certainly (adverb): Without doubt; definitely.
    • She will certainly attend the meeting.
  • Certainty (noun): The state of being certain; something that is certain to happen.
    • There is no certainty in the stock market.
Synonyms
  • Sure: Confident; not liable to fail.
  • Definite: Clearly stated or decided; not vague.
  • Inevitable: Certain to happen; unavoidable.
  • Assured: Confident or guaranteed.
Related Phrases (Phrasal Verbs)
  • Certain of: Feeling confident about something.
    • He was certain of his victory.
Related Idioms
  • A certain something: An appealing but hard-to-define quality.
    • She has a certain something that makes her very charismatic.
  • Nothing is certain but death and taxes: A saying meaning that very few things in life are guaranteed.
certain

She is certain that she locked the front door.

Adjective
  1. exercising or taking care great enough to bring assurance
    • be certain to disconnect the iron when you are through
    • be sure to lock the doors
  2. reliable in operation or effect
    • a quick and certain remedy
    • a sure way to distinguish the two
    • wood dust is a sure sign of termites
  3. established irrevocably
    • his fate is sealed
  4. certain to occur; destined or inevitable
    • he was certain to fail
    • his fate is certain
    • In this life nothing is certain but death and taxes- Benjamin Franklin
    • he faced certain death
    • sudden but sure regret
    • he is sure to win
  5. established beyond doubt or question; definitely known
    • what is certain is that every effect must have a cause
    • it is certain that they were on the bus
    • his fate is certain
    • the date for the invasion is certain
  6. having or feeling no doubt or uncertainty; confident and assured
    • felt certain of success
    • was sure (or certain) she had seen it
    • was very sure in his beliefs
    • sure of her friends
  7. definite but not specified or identified
    • set aside a certain sum each week
    • to a certain degree
    • certain breeds do not make good pets
    • certain members have not paid their dues
    • a certain popular teacher
    • a certain Mrs. Jones