To posit something is to assume or suggest that it is true. You can posit an idea or opinion.

When you posit, you submit an idea or give an opinion. Scientists posit many ideas — called hypotheses — that they then try to prove or disprove through experimentation and research. In science, you hear about positing a lot, and the same is true in math and logic. When you say "If X, then Y" you're positing a proposition. Positing can also mean to put something somewhere firmly — this means to deposit, fix, or situate.

Definitions of posit
  1. verb
    take as a given; assume as a postulate or axiom
    “He posited three basic laws of nature”
    synonyms: postulate
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    assert, insist
    assert to be true
    type of:
    presuppose, suppose
    take for granted or as a given; suppose beforehand
  2. verb
    put before
    synonyms: put forward, state, submit
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    type of:
    advise, propose, suggest
    make a proposal, declare a plan for something
  3. verb
    put (something somewhere) firmly
    “She posited her hand on his shoulder”
    synonyms: deposit, fix, situate
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    place in the earth and cover with soil
    deposit as a sediment
    type of:
    lay, place, pose, position, put, set
    put into a certain place or abstract location
  4. noun
    (logic) a proposition that is accepted as true in order to provide a basis for logical reasoning
    synonyms: postulate
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    show 8 types...
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    Bayes' postulate
    (statistics) the difficulty of applying Bayes' theorem is that the probabilities of the different causes are seldom known, in which case it may be postulated that they are all equal (sometimes known as postulating the equidistribution of ignorance)
    assumption, premise, premiss
    a statement that is assumed to be true and from which a conclusion can be drawn
    major premise, major premiss
    the premise of a syllogism that contains the major term (which is the predicate of the conclusion)
    minor premise, minor premiss, subsumption
    the premise of a syllogism that contains the minor term (which is the subject of the conclusion)
    an unproved statement put forward as a premise in an argument
    condition, precondition, stipulation
    an assumption on which rests the validity or effect of something else
    a postulated sequence of possible events
    (rhetoric) an assumption or underlying belief that connects evidence to a claim
    type of:
    (logic) a statement that affirms or denies something and is either true or false
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