1. informed or notified in advance; given prior knowledge or warning about something
Usage: often used in formal or official contexts

Examples

• The preinformed audience knew what to expect from the speaker.
• We were preinformed about the schedule change before the announcement.
• The preinformed committee members had already reviewed the proposal.
• Thanks to being preinformed, she was prepared for the interview questions.
• The preinformed staff handled the emergency more efficiently.