1An estimate or conjecture made without definite proof; an inference or supposition. In grammar, it also refers to the speaker's speculation (e.g., 'probably', 'might').
証拠がないので、それは単なる推量にすぎない。
There is no evidence, so that's merely conjecture.
彼の推量では、会議は来週に延期されるだろうということだ。
According to his conjecture, the meeting will probably be postponed until next week.
ニュースだけを聞いて推量で判断するのは危険だ。
It's risky to make judgments based only on news and conjecture.