Enter a clue or pattern or both:
The Clue
Frequency (9 letter answer)
The Answer
INCIDENCE
Tags
Notes
The answer INCIDENCE is so rare that it appears less than once every 2500 puzzles.
Definition
INCIDENCE as a noun:
1. (incidence, relative incidence) = the relative frequency of occurrence of something
2. the striking of a light beam on a surface; "he measured the angle of incidence of the reflected light"