alkupuolisko

Noun

 * 1) first half of anything, like of a period of time, semester, holiday, trip etc.
 * 2)  first half period of a game before the half-time

Usage notes
In the rules of most ballgames a "half" of a game is called in Finnish, and "first half" would thus be. The half-time i.e. the period between the halves is called in Finnish.