This is the 2017th most frequent Polish word.
głowie
"Head" (locative or dative form).
In this sentence, 'głowie' refers to the physical or abstract presence of the idea within the head.
Mam pomysł w głowie.
I have an idea in my head.
Here, 'głowie' is used metaphorically to signify the process of thinking.
Ona myśli intensywnie, co zrobić w tej sytuacji, w głowie analizując różne scenariusze.
She is thinking intensely about what to do in this situation, analyzing different scenarios in her head.
In this example, 'głowie' represents the mental capacity to understand or contain information.