假定 jiǎdìng to assume
to assume; to suppose; supposed; so-called; assumption; hypothesis
How to remember 假定: 假 fake + 定 decide = to assume.
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How it is used
- To assume/posit for the sake of argument; also the assumption itself - 假定他说的是真的 (jiǎdìng tā shuō de shì zhēn de) assuming what he says is true.
- More formal/logical than 假设 (jiǎshè) but very close; used in reasoning, math, and hypothetical setups.
- As a noun it's a premise or hypothesis. Register is analytical/academic.