This is the 1820th most frequent Portuguese word.
necessariamente
Necessarily.
Here, "necessariamente" is used as an adverb to signify 'in a necessary manner', implying that not all apparent things must conform to truth.
Nem tudo o que parece é necessariamente verdade.
Not everything that appears is necessarily true.
In this sentence, "necessariamente" functions as an adverb modifying 'need', indicating that it's not a mandate to perform the action at the present time.
Você não precisa necessariamente fazer isso agora.
You don't necessarily need to do this now.
"Necessariamente" is used as an adverb to express the idea that the solution in question might not compulsorily be the optimal choice.