Demonstration of the month (5)
I believe the answer is:
march
I believe this is a double definition.
'demonstration' is the first definition.
(type of protest or demonstration)
'the month' is the second definition.
(March is an example)
'of' is the link.
(Other definitions for march that I've seen before include "Proceed in procession" , "demo" , "Military walking style" , "Stride; month" , "Spring" .)