Lewis & Short

compĕtentĭa, ae, f. [competo] (postclass.),

  1. I. a meeting together, agreement: membrorum inter se, symmetry, Gell. 1, 1, 3; cf. Macr. Somn. Scip. 1, 19, 21.
  2. II. Esp., of the stars, conjunction, aspect: nasci ad eandem competentiam (sc. siderum), Gell. 14, 1, 26; Macr. Somn. Scip. 1, 6, 24 al.