A wicket - what is it?

When thinking of fencing as a must-have item around the house, I often find myself using the term wicket. It is difficult for me to determine where I know this word from and what its origin is, so I decided to look it up today and to my surprise, after doing an initial search of the internet, I am unable to determine the origin of the word.
What does the word mean and where does it come from? According to Wikipedia (the only one I could find was from this site), a gate is a narrow passage in a fence usually closed with a door. Often erected near a gate or in the gate itself. Also a narrow passage in walls (fortifications). It allows pedestrian traffic (without opening the gate). And that would be it. Nothing more! Even this definition does not fully explain where the word comes from, when it originated. We might be tempted to search for the meaning of the word gate, which also did not yield some spectacular results. After analysing the meanings of the word furta, all I can say is that the word probably has a strong connection with monastery gates. I will leave the official definitions and the Internet aside and add that, from my childhood, I remember that the main entrance to the courtyard (the one on the street side) was called a gate, while a wicket was the rear entrance to the garden.

With this in mind, it's fair to say that wikipedia gives the true definition, and it matches as closely as possible the image of a wicket I have in my mind from my childhood. Nowadays I think it's more common to use the word gate (as a small gate) when talking about fencing and gates, but for me it's the old-fashioned word wicket that shouldn't come out of our usage.