If A occurs exactly two times, one could say "A occurs twice."
If A occurs exactly three times, one could say "A occurs thrice." etc.
Not being a native English speaker, I don't know how to properly name these words that compress the expression for "number of occurences", however, I've found articles online that have expanded their realm of existence beyond the numerals of 1, 2 and 3, such as "septence" for 7, etc.
I wonder if there are 'compression words' like this for "odd" and "even number of times". I would find these words extremely useful. There are words like that in Czech, I am however unable to find their English equivalents. Do they exist?