ultrashort

Of or relating to radio waves with a wavelength less than 10 meters (33 feet).

Of or relating to optical pulses with typical durations of femtoseconds.

Of extremely short duration.

Extremely short.

Of or relating to fixed-income investments with extremely short maturities, usually less than one year.

Extremely short in duration, typically on the femtosecond scale

Having a wavelength of between 1 and 10 metree

Having a very short term of investment, typically less than a year

A bond with an extremely short term, typically less than a year