first period

English Thesaurus

1. the first division into which the play of a game is divided (noun.time)

hypernym	:	division, part, section,
definition	:	one of the portions into which something is regarded as divided and which together constitute a whole (noun.cognition)

part meronym	:	period of play, play, playing period,
definition	:	(in games or plays or other performances) the time during which play proceeds (noun.time)