A love affair.
A lover.
Courtship; flirtation.
The condition, or an instance, of being romantically or sexually involved with another person; an affair.
An obstruction of cables and spars across a river or harbour entrance.
The condition of being deeply involved and intricated (with politics, a group, another person, etc.)
The act of entangling.
An obstruction placed in front or on the flank of a fortification, to impede an enemy's approach.