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

(Latin: valere, to be strong, to be well, to be worth; strong; power, strength; and "fare well" [go with strength])

evaluate
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.
evaluation
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.
hexavalent
Combining with, or capable of, replacing six atoms of hydrogen or other univalent element or radical.
hexivalence
hexivalent
invalid (in VAL id)
1. Not factually or legally valid; null.
2. Falsely based or reasoned; faulty.
invalid (IN vuh lid)
1. A chronically ill or disabled person.
2. To make an invalid of.
invalidate
To make invalid or to nullify.
invalidation
invalidism
invalidity
invalidly
invaluable
Intensely or extremely useful or valuable.
multivalent
With several meanings or values; polyvalent.
nanoequivalent