This is the 12685th most frequent Russian word.
коротком
"Коротком" is the prepositional case, singular form of "короткий," meaning "short" in English.
Describes a 'short' timeframe, attributive usage.
Он говорил о коротком промежутке времени.
He spoke about a short period of time.
Qualifies a 'novel' as 'short', attributive usage.
В этом коротком романе события развиваются стремительно.
In this short novel, events develop rapidly.
Defines the 'dress' length as 'short', adjectival usage.