Ju

Jubilee Clip

A worm-gear hose clip

Julian Calendar

Introduced in 46 BC by the Roman ruler Julius Ceasar, this calendar assumes a year of 365.25 days, and uses a cycle in which 3 "ordinary" years of 365 days are followed by a "leap year" with 366 days.

Julian Day

Instituted by J. Julius Scaliger in 1582. The Julian date is independent of various calendars and chronological events.

Jump Discontinuity

A discontinuity in a function where the left and right-hand limits exist but are not equal to each other.

Junior Hacksaw

A metal blade of hardened steel having small, close teeth on one edge, held under tension in a sprung U-shaped frame.

Jupiter

The largest planet in our solar system.

Jury Evaluation

A name given to a field where the customer is given the opportunity to compare products and rank one versus the other.