Engagement

Merriam-Webster Online Dictionary
engagement (noun)
1.
a) an arrangement to meet or be present at a specified time and place - a dinner engagement
b) a job or period of employment especially as a performer
2.
something that - engages pledge
3.
a) the act of the state of being - engaging engaged
b) emotional involvement or commitment - seesaws between obsessive engagement and ambiguous detachment Gary Taylor
c) - betrothal
4.
the state of being in gear
5.
a hostile encounter between military forces