Source : Webster's Revised Unabridged Dictionary (1913)

Cross \Cross\, v. t. [imp. & p. p. {Crossed} (kr?st; 115); p.
   pr. & vb. n. {Crossing}.]
   1. To put across or athwart; to cause to intersect; as, to
      cross the arms.

   2. To lay or draw something, as a line, across; as, to cross
      the letter t.

   3. To pass from one side to the other of; to pass or move
      over; to traverse; as, to cross a stream.

            A hunted hare . . . crosses and confounds her former
            track.                                -- I. Watts.

   4. To pass, as objects going in an opposite direction at the
      same time. ``Your kind letter crossed mine.'' --J. D.
      Forbes.

   5. To run counter to; to thwart; to obstruct; to hinder; to
      clash or interfere with.

            In each thing give him way; cross him in nothing.
                                                  --Shak.

            An oyster may be crossed in love.     -- Sheridan.

   6. To interfere and cut off; to debar. [Obs.]

            To cross me from the golden time I look for. --Shak.

   7. To make the sign of the cross upon; -- followed by the
      reflexive pronoun; as, he crossed himself.

   8. To cancel by marking crosses on or over, or drawing a line
      across; to erase; -- usually with out, off, or over; as,
      to cross out a name.

   9. To cause to interbreed; -- said of different stocks or
      races; to mix the breed of.

   {To cross one's path}, to oppose one's plans. --Macaulay.

Crossing \Cross"ing\, n. [See {Cross}, v. t. ]
   1. The act by which anything is crossed; as, the crossing of
      the ocean.

   2. The act of making the sign of the cross. --Bp. Hall.

   3. The act of interbreeding; a mixing of breeds.

   4. Intersection, as of two paths or roads.

   5. A place where anything (as a stream) is crossed; a paved
      walk across a street.

   6. Contradiction; thwarting; obstruction.

            I do not bear these crossings.        --Shak.

Source : WordNet®

crossing
     n 1: traveling across
     2: a shallow area in a stream that can be forded [syn: {ford}]
     3: a point where two lines (paths or arcs etc.) intersect
     4: a junction where one street or road crosses another [syn: {intersection},
         {crossroad}, {crossway}, {carrefour}]
     5: a path (often marked) where something (as a street or
        railroad) can be crossed to get from one side to the other
        [syn: {crosswalk}, {crossover}]
     6: (genetics) the act of mixing different species or varieties
        of animals or plants and thus to produce hybrids [syn: {hybridization},
         {hybridisation}, {crossbreeding}, {cross}, {interbreeding},
         {hybridizing}]
     7: a voyage across a body of water (usually across the Atlantic
        Ocean)