lockage

noun
lock·age | \-kij, -kēj\
plural -s

Definition of lockage 

1a : an act or the process of passing something (as a boat) through a lock

b : something passed or passing through a lock especially : the quantity (as of logs) that can be locked at one time

2 : the construction of a system of locks (as in a canal) also : a system of locks

3 : toll paid for passing through a lock or locks (as of a canal)

4 : the vertical distance through which a boat is raised or lowered in passing through a lock or series of locks also : the volume of water involved in the process

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History and Etymology for lockage

lock entry 2 + -age

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