I. noun 1. [ mass noun] — arrangement in a straight line or in correct relative positions • the tiles had slipped out of alignment.
2. [ count noun] — the route or course of a railway or road. • four railways, all on different alignments.
• present-day road alignments.
3. [ count noun] —
[Archaeology] a linear arrangement of stones.
• there were originally at least four massive stone alignments running from west to east.
4. a position of agreement or alliance • the uncertain nature of political alignments.
– origin late 18th cent.: from French alignement, from aligner (see align).