(idiomatic) To seem logical, rational, or reasonable; to make sense.

(US, idiomatic) For reasons unknown and not worth speculating on.

(law) A fictional person used as a comparative legal standard to represent an average member of society and how he or she would behave or think, especially in determining negligence; sometimes formulated as "a person of ordinary prudence exercising due care in like circumstances."

(nonce word) A twofold or double reason.

Alternative form of age of reason

(Internet slang) Used to avoid specifying the reasons for something, perhaps because specifying them would be tangential to the point at hand, or perhaps the reasons are too many or too involved or too time consuming to specify, or perhaps because they are not sound or are not known to the speaker.

To an extent which is reasonable; not beyond what is reasonable.

plural of reasonable doubt

plural of reasonable person

plural of reasonable person