1. [n]  the act of teaching at school
2. [n]  the training of an animal (especially the training of a horse for dressage)
3. [n]  the process of being formally educated at a school; "what will you do when you finish school?"

SCHOOLING is a 9 letter word that starts with S.

1. \School"ing\, n.
   1. Instruction in school; tuition; education in an
      institution of learning; act of teaching.
   
   2. Discipline; reproof; reprimand; as, he gave his son a good
      schooling. --Sir W. Scott.
   
   3. Compensation for instruction; price or reward paid to an
      instructor for teaching pupils.
   
   

2. \School"ing\, a. [See {School} a shoal.] (Zo["o]l.)
   Collecting or running in schools or shoals.
   
   
   
      Schooling species like the herring and menhaden. --G. B.
                                                  Goode.