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.
Examples of certain
certain
They can have side effects and should not be taken with certain other medicines.
From the orlandosentinel.com
The political uncertainty in Lisbon makes its economic future much more certain.
From the businessweek.com
Certain activities or modes of travel increase your risk of exposure to disease.
From the orlandosentinel.com
To a certain ignorant minority, it always has to veer off into bigoted nonsense.
From the bostonherald.com
Clinics are offered on certain days in April, and no appointments are necessary.
From the tennessean.com
Most leases are set to terminate Monday, though it may vary for certain tenants.
From the news-journalonline.com
Despite Wednesday's vote, the law is all but certain to remain in place for now.
From the online.wsj.com
Certain areas of the brain of a newborn baby are particularly flexible, however.
From the sciencedaily.com
You have to be of a certain age to remember Houston's lovely Sakowitz wine shop.
From the chron.com
More examples
Certain(a): 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"
Sealed: established irrevocably; "his fate is sealed"
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"
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"
(certainly) surely: definitely or positively (`sure' is sometimes used informally for `surely'); "the results are surely encouraging"; "she certainly is a hard worker"; "it's going to be a good day for sure"; "they are coming, for certain"; "they thought he had been killed sure enough"; "he'll ...
Sure, positive, not doubting; Having been determined but unspecified. The quality of some particular subject or object which is known by the speaker to have been specifically singled out among similar entities of its class
(Certainly) many statistical models had emerged a long time ago. Machine learning has marked a milestone in the evolution of computer science. ...