Definitions of crossing:

• noun:   traveling across
• noun:   a voyage across a body of water (usually across the Atlantic Ocean)
• noun:   a path (often marked) where something (as a street or railroad) can be crossed to get from one side to the other
• noun:   a point where two lines (paths or arcs etc.) intersect
• noun:   a shallow area in a stream that can be forded
• noun:   (genetics) the act of mixing different species or varieties of animals or plants and thus to produce hybrids
• noun:   a junction where one street or road crosses another