ä­kil­li­nen ­kas­vusubstantiivi

1. 1.äkillinen tai jyrkkä voimakas lisääntyminen

1. 1.a sudden or abrupt strong increase; "stimulated a surge of speculation"; "an upsurge of emotion"; "an upsurge in violent crime"
2. 2.a sudden sharp increase in the relative numbers of a population

Hierarkia