The term 'state of equilibrium' can be defined as a state of balance or stability. The crossword solution for this term is 'STASIS, ' which is a noun meaning a state of inactivity or a period of rest. STASIS is often used to describe a situation in which opposing forces are balanced and no change is occurring. This term is commonly used in physics, economics, and politics to describe a situation in which all forces are equal and no progress is being made.