certain

As an adjective certain

is sure, positive, not doubting.

As a determiner certain

is 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.

As a noun certainity is

misspelling of lang=en.

As a noun theory

is (obsolete) mental conception; reflection, consideration.

As an adjective certain is

certain.

As a noun taxonomy

is the science or the technique used to make a classification.

As an adjective certain is

certain.

As a verb proved

is (prove).

As an adjective certain is

certain.

As adjectives the difference between expected and certain

is that expected is anticipated; thought to be about to arrive or occur while certain is certain.

As a verb expected

is (expect).

As adjectives the difference between given and certain

is that given is already arranged while certain is sure, positive, not doubting.

As a verb given

is past participle of lang=en.

As a preposition given

is considering; taking into account.

As a noun given

is a condition that is assumed to be true without further evaluation.

As a determiner certain is

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.

As adjectives the difference between certain and apodictical

is that certain is certain while apodictical is (archaic) apodictic; being clearly demonstrable; certain.