Crucial (adjective)

1. Having a decisive influence on the outcome of a situation.
2. Of great importance or significance.
3. Essential or critical to the success of a plan or operation.
4. Determining the success or failure of a situation.
5. Vital or indispensable.

Origin:

The word "crucial" comes from the latin word "crux", meaning "cross" or "decisive point". the term has been in use since the 17th century to describe something that is of great importance or having a decisive influence on a situation.

Examples:

1. The outcome of the election was crucial to the future of the country.
2. The next few hours were crucial in determining the success of the mission.
3. The crucial point in the debate was the candidate's stance on education.
4. The information was crucial to solving the case.
5. Getting enough sleep each night is crucial for good health.