transiency

adjective

1. 1. passing away with time; not permanent; temporary; transitory
   2. passing quickly or soon; fleeting; ephemeral
2. ☆ staying only for a short time: the transient population at resorts

Origin: L transiens, prp. of transire: see transit

noun

1. ☆ a transient person or thing: transients at a hotel
2. Elec. a temporary component of a current, resulting from a voltage surge, a change from one steady-state condition to another, etc.