1. be intermediate between two taxonomic groups;

"These species osculate"

2. have at least three points in common with;

"one curve osculates the other"

"these two surfaces osculate"

3. touch with the lips or press the lips (against someone's mouth or other body part) as an expression of love, greeting, etc.;

"The newly married couple kissed"

"She kissed her grandfather on the forehead when she entered the room"