Collins Concise English Dictionary © HarperCollins Publishers::

postulate vb /ˈpɒstjʊˌleɪt/(tr; may take a clause as object)
  1. to assume to be true or existent; take for granted
  2. to ask, demand, or claim
  3. to nominate (a person) to a post or office subject to approval by a higher authority
n /ˈpɒstjʊlɪt/
  1. something taken as self-evident or assumed as the basis of an argument
  2. a necessary condition or prerequisite
  3. a fundamental principle
  4. an unproved and indemonstrable statement that should be taken for granted: used as an initial premise or underlying hypothesis in a process of reasoning
Etymology: 16th Century: from Latin postulāre to ask for, require; related to pōscere to request

ˌpostuˈlation n

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