1. noun /ˈkaʊntə/
a) An object (now especially a small disc) used in counting or keeping count, or as a marker in games, etc.
He rolled a six on the dice, so moved his counter forward six spaces.
b) Any stone lying closer to the center than any of the opponents stones.
He put his money on the counter, and the shopkeeper put it in the till.
2. adverb /ˈkaʊntə/
Contrary, in opposition; in an opposite direction.
"Running counter to all the rules of virtue." -Locks.
3. verb /ˈkaʊntə/
b) To return a blow while receiving one, as in boxing.
4. adjective /ˈkaʊntə/
His carrying a knife was counter to my plan.
Wikipedia foundation.