To place things in a line or arrange them so they form a straight alignment.
From Late Latin 'allineatus,' past participle of 'allineare,' from 'ad-' (to) plus 'linea' (line). The word literally means 'to make into a line' and is an older or formal variant of 'align.'
This is an archaic word that fell out of favor in everyday speech, but architects and surveyors still occasionally use it when they need a fancy term for making things perfectly straight—it's like the old English cousin of our modern word 'align!'
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