Decad n. : A decade.

Example:
Which of the following characterizes China’s regional development policy during the first two and a half Decad?

Taxonomy
DECAD, diffractive, optiques, elements, cgh, download, optics, diffractive optics, Diffractive Elements, phase function, laser, DOE data, olivier, biophotonics, computer, holograms, Optique Diffractive, surfaces.

Defination from the web:
... The DECAD website reached 10.000 visitors last April! Version 2.43 of DECAD has been downloaded by more than 250 users from various private companies, research centers or universities around the world. ...