noun

1. An arrangement of items in a line.

2. The process of adjusting a mechanism such that its parts are aligned; the condition of having its parts so adjusted.

3. An alliance of factions.

4. The conjunction of two celestial objects.

5. The precise route or course taken by a linear way (road, railway, footpath, etc.) between two points.

6. In a roleplaying game, one of a set number of philosophical attitudes a character can take.

7. A way of arranging DNA, RNA or protein sequences in order to identify regions of similarity.