[hahy-poth-uh-sahyz, hi-]
verb (used without object), hypothesized, hypothesizing.
to form a hypothesis.
verb (used with object), hypothesized, hypothesizing.
to assume by hypothesis.
Also, hypothecate; especially British, hypothesise.

1730–40; hypothes(is) + -ize

hypothesizer, noun
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
hypothesize or hypothesise (haɪˈpɒθɪˌsaɪz)
to form or assume as a hypothesis
hypothesise or hypothesise
hy'pothesizer or hypothesise
hy'pothesiser or hypothesise

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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American Heritage
Science Dictionary
hypothesize   (hī-pŏth'ĭ-sīz')  Pronunciation Key 
To form a hypothesis.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
As the scientists behind the study hypothesize, it may be a matter of feeding
Ask students to hypothesize what would happen during an oil spill if oil and
  water were the same density.
Students should then hypothesize why these two images are so similar.
Ask students to look at the collage and hypothesize what these animals eat.
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