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The plural of the noun observance is observances.
i am observance to the science project
How does the observance of RA 3019 affects How does the observance of RA 3019 affect!!!!!!!!!!!
At church we show reverential observance by making the sign of the cross.
In observance of Memorial Day, we visited Arlington Cemetery.
The church will be open from 1:00 pm to 3:00 pm for the observance of Good Friday.