viscosity

From Middle French viscosité, from Old French viscosité, from Medieval Latin viscositas; analysable as viscous +‎ -ity.

viscosity (countable and uncountable, plural viscosities)

1. (uncountable) The state of being viscous.
2. (countable, physics) A quantity expressing the magnitude of internal friction in a fluid, as measured by the force per unit area resisting uniform flow.
3. (uncountable, psychology) A tendency to prolong interpersonal encounters.

• fluidity