integral
/ɪnˈtɛgrəl/ iNTEGRəl
Definitions
1. adjective
forming a complete whole; essential
“Math is an integral part of her studies.”
2. noun
a whole or a complete part of a larger whole
“The integral of the function is often used in calculus.”
3. verb
to make a whole or complete by adding something
“The missing piece of the puzzle was integral to completing the picture.”