Ensure (verb)

1. Make certain that something will occur or be the case.
2. Make sure or certain that something will happen.
3. To guarantee or secure that something will happen.
4. To make certain that something is done or that something will happen.
5. To make sure that something will happen.

Origin:

Mid 16th century (in the sense "make sure, make certain"): from en- "make" + sure "sure".

Examples:

1. He ensured that the work was done.
2. She ensured that the letter was sent.
3. They ensured that the package was delivered.
4. I will ensure that my passport is valid.
5. The company ensured that the product was safe.