This is the 673rd most frequent Polish word.
jednym
"Jednym" means "one" or "single" in the instrumental case in Polish.
Here, 'jednym' is used to denote 'one (of),' specifically as part of a group.
Jestem jednym z najlepszych uczniów w klasie.
I am one of the best students in the class.
In this context, 'jednym' indicates something done in a single motion or action, emphasizing singularity.
Zamknij to pudełko jednym ruchem.
Close this box with one motion.
Here, 'jednym' functions to introduce a reason, indicating it is singular among others.