This is the 4963rd most frequent Russian word.
короткое
"Короткое" means "short" in English.
Here, 'короткое' is used as an adjective describing the noun 'сообщение' (message), indicating its length and functioning as an attribute of the noun.
У меня короткое сообщение для вас.
I have a short message for you.
In this sentence, 'короткое' modifies the noun 'путешествие' (journey) and describes the temporal duration as brief.
Это было короткое путешествие.
It was a short journey.
'Короткое' functions to describe the length of the noun 'платье' (dress), relating to its physical dimensions.