load factor

Short definition from Wiktionary

Noun

1. 1
   The acceleration experienced by an aircraft along a given axis at a particular instant in time.
2. 2
   The percentage of a transportation system's maximum passenger capacity that is actually used.
3. 3
   The mean load over a given time period divided by the peak load occurring during the same time period, providing a measure of how efficiently an electric system's capacity is being used.
4. 4
   The proportion of the buckets in a hash table which contain entries.