Having prior knowledge of an event means you are aware of the event .

Something that has begun is said to be underway.

An imaginary place where everything is perfect for you is often called utopia. 

After a long separation, the coming together again is said to reunite.

A special force that may cause good or back circumstances is often called luck.

A group of people enrolled for military service is the militia.

The ability or capacity to do something with energy of any type is power.

When you make more reservations than needed is said to overbook.

When you feel stranded and alone you need a lifeline to connect once more to people.

A stomach ache plus headache may make you feel nauseous.