expression
Formal/literary expression equivalent to かもしれない. Used to express possibility or uncertainty, often in written or elevated speech.
See also: かも知れない
明日は雨が降るやもしれず、傘を持って行こう。
It might rain tomorrow, so let's take an umbrella.
彼の話は真実であるやもしれない。
His story may be true.