XC
WordNet
adjective
(1) Being ten more than eighty
noun
(2) The cardinal number that is the product of ten and nine
WiktionaryText
Noun
- A running sport popular in US high schools, colleges, etc. where participants race over varying terrain (e.g. golf courses, roads, etc.) in approximately 5 - 10K races. Abbreviated XC.
- A phase of the equestrian sport of three day eventing, which the horse and rider travel over varied terrain and jump natural obstacles.