udział

Etymology
..

Noun

 * 1)  role, part; input, contribution
 * 2)  share, stock
 * 3)  comeuppance; reward or punishment
 * 4)  division of property
 * 5)  division
 * 6)  interest; sympathy
 * 7)  division
 * 1)  division
 * 2)  interest; sympathy
 * 3)  division
 * 1)  division

Declension
The locative singular form is obsolete.