cadre

Short definition from Wiktionary

Noun

1. 1
   A frame or framework.
2. 2
   The framework or skeleton upon which a new regiment is to be formed; the officers of a regiment forming the staff.
3. 3
   The core of a managing group, or a member of such a group.
4. 4
   A small group of people specially trained for a particular purpose or profession.
5. 5
   Synonym of RAII.