reckoner

noun

One who reckons. / (archaic) An accountant; one who computes or calculates.

He is a skilled reckoner who can quickly calculate complex equations.

意味（1）

One who reckons.

“No. Not quite a month.—It is only four weeks to-morrow since I left Mansfield.”

“You are a most accurate and honest reckoner. I should call that a month.”

意味（2）

(archaic) An accountant; one who computes or calculates.