This is the 3654th most frequent Spanish word.
necesariamente
Necessarily.
Necessarily modifies 'tengo' to show that the action isn't obligatory.
No necesariamente tengo que ir al mercado hoy.
I don't necessarily have to go to the market today.
Necessarily modifies 'significa' to convey that the implication isn't absolute.
El hecho de que llueva no significa necesariamente que el día será malo.
The fact that it's raining does not necessarily mean that the day will be bad.
Necessarily modifies 'es' to express that the statement isn't always true.