valid-, val-, vale-, -vail, -valent, -valence

1. To examine and judge.
2. To consider or examine something in order to judge its value, quality, importance, extent, or condition.
3. To put a value on; to estimate the monetary value of somehting.

1. Assessing the value or the act of considering or examining something in order to judge its value, quality, importance, extent, or condition.
2. A statement of value; a sopken or written statement of the value, quality, importance, extent, or condition of something.

Combining with, or capable of, replacing six atoms of hydrogen or other univalent element or radical.

1. A chronically ill or disabled person.
2. To make an invalid of.

1. Not factually or legally valid; null.
2. Falsely based or reasoned; faulty.

To make invalid or to nullify.

1. Extremely costly or precious; inestimable worth: The paintings in Rose's home were invaluable and priceless because they were all originals by famous painters.
2. Referring to something which is very useful: indispensible: In her kitchen, Natasha thought that her dishwasher was an invaluable appliance and she would never want to miss it!

With several meanings or values; polyvalent.