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])

Non est vivere sed valere vita est.
Life is not being alive but being well.

Also translated as, "Life is more than just being alive."

paravalent
Potent sexually only in unusual circumstances.
pentavalent
prevail
1. To be greater in influence or strength; to triumph.
2. To be or become effecive; to win out.
3. To be in current force, to use, or to effect.
prevalence
prevalence, prevalent
Widely existing, accepted, or practiced.
prevalent
prevalently
pronovalent
Sexually potent only in the prone position.
quadrivalence
quadrivalent
quantivalence
quantivalent
quinquevalence
quinquevalent