in such a manner as could not be otherwise
"it is necessarily so"
"we must needs by objective"
Inevitably; of necessity.
"The project will inevitably fail if we do not secure funding by Friday."
In plain English: Necessarily means something must happen because it is required by the situation.
"You don't necessarily have to finish your homework by tonight if you plan to study later."
Usage: Use necessarily to indicate that something must happen or be true under specific conditions, rather than always happening. It clarifies that an outcome is logical or required by the circumstances, not guaranteed in every situation.
Necessarily comes from combining the word necessary with the suffix -ly. It entered English as a straightforward formation to create an adverb meaning "in a necessary manner."