(1):

(v. i.) To kiss one another; to kiss.

(2):

(v. i.) To touch closely. See Osculation, 2.

(3):

(v. i.) To have characters in common with two genera or families, so as to form a connecting link between them; to interosculate. See Osculant.

(4):

(v. t.) To kiss.

(5):

(v. t.) To touch closely, so as to have a common curvature at the point of contact. See Osculation, 2.