What is "frecency"

n. (context computing English) Any heuristic measure that combines the frequency and recency of visits to a given URI, used by some web browsers to rank URIs.

Frecency is any heuristic that combines the frequency and recency into a single measure.

In its simplest form the frequency and recency rating can be added to form a frecency rating. The ratings can be found by sorting items by most recent and most frequent respectively. A decayed calculation using logarithms can also be used.