A tool, device, or person that aligns things; something that brings objects into proper position or adjustment with each other.
From 'align' (from Old French 'aligner' to put in a line, from 'a-' + 'ligne' line) + '-er' (one who does or tool that does). The modern suffix '-er' creates both agents and instruments.
Aligners are everywhere in modern life—orthodontic aligners straighten teeth, wheel aligners fix cars, software aligners organize data. It's a word that really proved its usefulness across industries.
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