LekhoriLekhoriSure in one's mind, positive; absolutely confident in the truth of something.
I was certain of my decision.
Not to be doubted or denied; established as a fact.
Now that more experiments have been run, the theory is certain and the argument is settled.
Sure to happen, inevitable; assured.
Having been determined but not specified.
Certain people are good at running.
Unnamed or undescribed members (of).
She mentioned a series of contracts, of which certain are not cited.
A surname.
From Middle English certeyn, certein, certain, borrowed from Old French certain, from a Vulgar Latin unattested form *certānus, extended form of Latin certus (“fixed, resolved, certain”), of the same ...
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It is certain that Spain will reach the finals. / Spain is now certain to reach the finals. / Spain is now certain of a place in the finals.