adversary – n. an enemy
navigation – n. the act of moving in a boat or ship over an area of water
assure – v. to make something certain
detain – v. to officially prevent someone from leaving a place
assembly – n. to meet together with other people
milestone – n. an important point in the progress or development of something
tinderbox – n. a situation that suddenly can turn violent
pivot – v. the action of turning around a point
vision – n. a clear idea about what should happen or be done in the future