This is the 1643rd most frequent Portuguese word.
nessa
"Nessa" means "in that" or "on that" (feminine singular form).
In this sentence, 'nessa' is a contraction of 'em' (in) + 'essa' (that, feminine), indicating the location within a specific feminine noun, 'casa' (house).
Nessa casa, há muitas flores.
In this house, there are many flowers.
Here, 'nessa' combines 'em' (at/in/on) and 'essa' (that, feminine) to indicate a point in time that is feminine in grammatical gender, 'manhã' (morning).
Nessa manhã, senti uma brisa agradável.
In this morning, I felt a pleasant breeze.
In this example, 'nessa' merges 'em' (about) and 'essa' (that, feminine), referring to the abstract feminine concept, 'ideia' (idea).