A person or device that arranges items in alphabetical order, or someone who teaches the alphabet to others.
From 'alphabet' (from Greek 'alpha' and 'beta,' the first two letters) plus '-ise' (British verb formation) plus '-r' (agent noun), formed in the 19th-20th centuries.
Before computerized sorting, professional 'alphabetisers' were essential library and filing room workers—their skill at organizing was so valued that it was a recognized occupation!
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