D defs.my
Entry 1 sense Webster, 1913

Allineation

· Al·lin·e·a·tion · IPA
01 n. Alignment; position in a straight line, as of two planets with the sun.
  1. 1.
    Alignment; position in a straight line, as of two planets with the sun.
    “The allineation of the two planets.” — C. A. Young.