Cases of word usage

1) to spoil the appearance of (something) by marking or damaging the surface (deface)

2) marking (a person, thing) as clearly different (distinctive)

3) an instrument for measuring or marking distances, angles etc (dividers)

4) marking (bad behaviour) seem less serious (by providing an excuse) (extenuating)

5) first; marking the start; a way in or out; a beginning; a position (in a business, firm) which is vacant (opening)

6) an upright length of wood or metal supporting or marking something; a job; a place where a soldier is (to be) on duty; a system of collecting, sorting and delivering letters, parcels etc (post)