A substance used to drive forward or propel something, such as a rocket or missile.

A strong dedication or promise to do something, often involving time and effort.

The act of something happening or taking place, often unexpectedly.

The process of eliminating doubts or fears, often by providing clarity or reassurance.

To prevent someone from doing something or to discourage them from a particular action.

Feeling sad or disappointed about something that has happened or been done, often with a sense of loss.

Feeling sad or disappointed about a particular situation or action, usually something that cannot be changed.

To be dedicated to a cause, activity, or relationship, indicating a firm intention to fulfill responsibilities.

A device that sends or receives signals, often used in communication systems.

A person or device that manages or regulates the operation of a system or equipment.