This is the 2142nd most frequent Polish word.
planie
"Planie" in Polish means "burning" or "flaming," typically referring to the action or state of fire.
In this sentence, "planie" refers to the concept of blazing, as in a large and intense fire.
Ogień był w pełnym planie i wszyscy byli w niebezpieczeństwie.
The fire was in full blaze, and everyone was in danger.
Here, "planie" is part of the phrase "planuje filmowym," referring to a film set or scene.
Na planie filmowym panowała świetna atmosfera.
On the film set, there was a great atmosphere.
Finally, "mam w planie" uses "planie" to infer a planned intention or schedule.