A barrier constructed across a road, especially as a military defence
An obstacle, barrier, or bulwark.
A place of confrontation.
to close or block a road etc., using a barricade
to keep someone in (or out), using a blockade, especially ships in a port
The process of synapses becoming more capable of transmitting the same type of signal each time certain types of sensory signals pass through sequences of these synapses.
The act of facilitating or making easy.