This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. A handbook of mathematical tables used to facilitate computation.

n. One who reckons.

n. An accountant.

n. One who reckons or computes; also, a book of calculations, tables, etc., to assist in reckoning.

n. One who reckons or computes: as, a rapid reckoner.

n. Something that assists a person to reckon or cast up accounts, as a book containing a series of tables; a ready-reckoner.

n. an expert at calculation (or at operating calculating machines)

n. a handbook of tables used to facilitate computation

"new Radiohead video:: "reckoner" winning animated video for "Reckoner," chosen by the band as the song's official video."

handbook    vade mecum    enchiridion   

deck-load    delimitation    arithmetician    washing-stand    helpin    Tonga    hard-target    sneak-thief    warmint    fellahin