If vs. Suppose — What's the Difference?

In the event that

Think or assume that something is true or probable but lack proof or certain knowledge

Granting that

Be required to do something because of the position one is in or an agreement one has made

On the condition that

To assume to be true or real for the sake of argument or explanation

Although possibly; even though

To believe, especially on uncertain or tentative grounds

Whether

To consider to be probable or likely

Used to introduce an exclamatory clause, indicating a wish

To imply as an antecedent condition; presuppose

A possibility, condition, or stipulation

To consider as a suggestion

Supposing that, assuming that, in the circumstances that; used to introduce a condition or choice.

To imagine; conjecture.

(computing) In the event that a statement is true (a programming statement that acts in a similar manner).

(transitive) To take for granted; to conclude, with less than absolute supporting data; to believe.

Supposing that; used with past or past perfect subjunctive indicating that the condition is closed.

(transitive) To theorize or hypothesize.

Supposing that; given that; supposing it is the case that.

(transitive) To imagine; to believe; to receive as true.

Although; used to introduce a concession.

To reckon to be, to account or esteem as.

Whether; used to introduce a noun clause, an indirect question, that functions as the direct object of certain verbs.

(transitive) To require to exist or to be true; to imply by the laws of thought or of nature.

Even if; even in the circumstances that.

(transitive) To put by fraud in the place of another.

Introducing a relevance conditional.

To represent to one's self, or state to another, not as true or real, but as if so, and with a view to some consequence or application which the reality would involve or admit of; to imagine or admit to exist, for the sake of argument or illustration; to assume to be true; as, let us suppose the earth to be the center of the system, what would be the result?

(informal) An uncertainty, possibility, condition, doubt etc.

To imagine; to believe; to receive as true.

In case that; granting, allowing, or supposing that; - introducing a condition or supposition.

To require to exist or to be true; to imply by the laws of thought or of nature; as, purpose supposes foresight.

Whether; - in dependent questions.

To put by fraud in the place of another.

To make supposition; to think; to be of opinion.

Supposition.

Express a supposition;

Expect, believe, or suppose;

To believe especially on uncertain or tentative grounds;

Take for granted or as a given; suppose beforehand;

Require as a necessary antecedent or precondition;