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Vine's Expository Dictionary of NT Words [1]

1: Νομίζω (Strong'S #3543 — Verb — nomizo — nom-id'-zo )

"to consider, suppose, think," is rendered "to suppose" in  Matthew 20:10;  Luke 2:34;  3:23;  Acts 7:25;  14:19;  16:27;  21:29;  1—Timothy 6:5; in  1—Corinthians 7:26 , AV (Rv, "I think"); in  Acts 16:13 , the RV adheres to the meaning "to suppose," "(where) we supposed (there was a place of prayer);" this word also signifies "to practice a custom" (nomos) and is commonly so used by Greek writers. Hence the AV, "was wont (to be made);" it is rendered "to think" in  Matthew 5:17;  10:34;  Acts 8:20;  17:29;  1—Corinthians 7:36 . See Think.

2: Δοκέω (Strong'S #1380 — verb — dokeo — dok-eh'-o )

"to be of opinion," is translated "to suppose" in  Mark 6:49;  Luke 24:37;  John 20:15;  Acts 27:13; in the following, AV "suppose," RV, "think,"  Luke 12:51;  13:2;  Hebrews 10:29 . It is most frequently rendered "to think," always in Matthew; always in John, except  John 11:31 , "supposing," RV [where the best texts have this verb (for lego, AV, "saying")], and  John 20:15 (see above).

3: Ὑπολαμβάνω (Strong'S #5274 — Verb — hupolambano — hoop-ol-am-ban'-o )

when used of metal action, signifies "to suppose,"  Luke 7:43;  Acts 2:15 . See Answer , Receive.

4: Ὑπονοέω (Strong'S #5282 — Verb — huponoeo — hoop-on-o-eh'-o )

"to suspect, to conjecture," is translated "suppose ye" in  Acts 13:25 , RV (AV, "think ye"); "I supposed" in  Acts 25:18 . See Deem.

5: Οἶμαι (Strong'S #3633 — Verb — oiomai | oimai — oy'-om-ahee, oy'-mahee )

signifies "to expect, imagine, suppose;" it is rendered "to suppose" in  John 21:25;  Philippians 1:17 , RV (AV, ver. 16, "thinking"); "think" in  James 1:7 . See Think.

 2—Corinthians 11:5 1—Peter 5:12 Philippians 2:25

King James Dictionary [2]

Suppose suppo'ze. L. suppositus, suppono.

1. To lay down or state as a proposition or fact that may exist or be true, though not known or believed to be true or to exist or to imagine or admit to exist, for the sake of argument or illustration. Let us suppose the earth to be the center of the system, what would be the consequence?

When we have as great assurance that a thing is, as we could possibly, supposing it were, we ought not to doubt of its existence.

2. To imagine to believe to receive as true.

Let not my lord suppose that they have slain all young men, the king's sons for Ammon only is dead.  2 Samuel 13

3. To imagine to think.

I suppose,

If our proposals once again were heard--

4. To require to exist or be true. The existence of things supposes the existence of a cause of the things.

One falsehood supposes another, and renders all you say suspected.

5. To put one thing by fraud in the place of another. Not in use.

Webster's Dictionary [3]

(1): ( v. i.) To make supposition; to think; to be of opinion.

(2): ( v. t.) To put by fraud in the place of another.

(3): ( v. t.) To require to exist or to be true; to imply by the laws of thought or of nature; as, purpose supposes foresight.

(4): ( n.) Supposition.

(5): ( v. t.) To imagine; to believe; to receive as true.

(6): ( v. t.) 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?