How do you spell the word that means "a formal assurance that certain conditions will be fulfilled"?

How do you spell the word that means "conditions or practices conducive to maintaining health and preventing disease"?

How do you spell the word that means "without any delay"?

How do you spell the word that means "free from outside control; not subject to another's authority"?

How do you spell the word that means "the ability to make considered decisions or come to sensible conclusions"?

How do you spell the word that means "facts, information, and skills acquired through experience or education"?

How do you spell the word that means "a sudden electrostatic discharge during a thunderstorm"?

How do you spell the word that means "a person living near or next door to the speaker"?

How do you spell the word that means "a particular time or instance of an event"?

How do you spell the word that means "continuing firmly in a course of action in spite of difficulty"?