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It seems to me to be programmingese--what was once a noun becomes a verb
because the programmer doesn't have any other word to discribe it. Many
people condemn this practice, but not me--it is necessary, inevitable,
and enriching.
This is what "The Computer Glossary", 5th edition, by Alan Freedman says:
"Decrement: To subtract a number from another number. Decrementing a counter
means to subtract 1 or some other number from its current value."