Any form of formal isolation or inhibition of something, especially with the force of law or arms.
The ships or other forces used to effect a naval blockade.
Inhibition of the activity (function) of chemical messengers or their receptors, such as (often) receptor antagonism.
The physical blocking or surrounding of a place, especially a port, in order to prevent commerce and traffic in or out.
Preventing an opponent's pawn moving by placing a piece in front of it.
To create a blockade against.
The act of one who pickets (in any sense).