A protective shield or barrier made of energy to protect or isolate a person, area or object.
Computer: Specify frequency pattern...
Captain: I don't give a damn just create a forcefield!
verb: the act of putting up a metaphorical or litteral barrier between yourself (the victim) and the forcee, in order to prevent furcher enforcement. There are many different techniques in deploying the force field, usually relating to the speed of which it is deployed. Also, there are many different types of focefields, some are more effective than others, depending on the creepiness of the enforcer.
Noun: the actual barrier that is used to shield oneself (or a group) from a particular force.