rivet

Short definition from Wiktionary

Noun

1. 1
   A cylindrical mechanical fastener that attaches multiple parts together by fitting through a hole and deforming the head(s) at either end.
2. 2
   Any fixed point or certain basis.
3. 3
   A light kind of footman's plate armour; an almain rivet.

Verb

1. 1
   To attach or fasten parts by using rivets.
2. 2
   To install rivets.
3. 3
   To command the attention of.
4. 4
   To make firm or immovable.

Proper noun

1. 1
   A surname from French.