Definitions
1.nounThe act of preventing or hindering; obstruction of action, access, or approach; thwarting."a fire prevention campaign"
2.nounAny measure intended to limit health-related risks (such as information campaigns, vaccination, early diagnosis etc.).
3.nounThe act of going, or state of being, before.
4.nounAnticipation; especially, anticipation of needs, wishes, hazards and risks
5.nounPrecaution; forethought.