Definition from Wiktionary, the free dictionary
Alternative forms 
kopek (plural kopeks)
- A Russian monetary unit equal to one hundredth of a ruble.
- Same as kopiyka, a Ukrainian monetary unit equal to one hundredth of a hryvnia.
Usage notes 
Kopek is the favored spelling used by the Moscow Times, whereas some English dictionaries prefer kopeck.
one-hundredth of a ruble