Noun, pl. equilibriums or equilibria
1. A condition of a system in which all competing influences are balanced, in a wide variety of contexts (wikipedia.org)
2. A state of balance between opposing forces or actions that is either static (as in a body acted on by forces whose resultant is zero) or dynamic (as in a reversible chemical reaction when the velocities in both directions are equal) (merriam-webster.com)
3. A state of intellectual or emotional balance. (merriam-webster.com)
Word origin: Latin aequilībrium : aequi-, equi– + lībra (balance).