vital >> ˈvʌɪt(ə)l
Definition: [adjective] absolutely necessary; essential.
Example: secrecy is of vital importance
Definition: [adjective] full of energy; lively.
Example: a beautiful, vital girl
Definition: [adjective] fatal.
Example: the wound is vital
Definition: [noun] the body's important internal organs.
Example: he felt the familiar knot contract in his vitals