Adjective : It is mandatory that all students take two years of math. ,a mandatory clause.    From Dictionary.com. 

But on this issue of mandatory versus nonmandatory (OFF-MIKE) going around trying to avoid buying health care coverage.    From Wordnik.com.  [CNN Transcript Jun 3, 2007] Reference

Nor is the law a permissible but nonmandatory accommodation of the many religions that think it improper to bring weapons into a house of worship.    From Wordnik.com.  [The Volokh Conspiracy » Does CHL ban in churches violate the First Amendment?] Reference

"My sense is that it's going to be a mix of mandatory things and some nonmandatory with a sound floor so as to avoid the race to the bottom in regulation," Mr. Draghi said.    From Wordnik.com.  [Swap Fears Are Growing, Draghi Says] Reference

Spearheading a campaign to place women on juries in New York, with the help of newly elected women in the New York state legislature she finally won nonmandatory service in 1937.    From Wordnik.com.  [Caroline Klein Simon.] Reference

This is an organization that certainly does useful things at the lower level of its sections and divisions, but it's one that also was recently led by Michael Gorman, wastes its time passing resolutions irrelevantly condemning the Darfur genocide, and misunderstands high school-level economics by trying to persuade people to agree to "nonmandatory minimum salary guidelines" for various positions.    From Wordnik.com.  [One thing ALA probably *isn't* guilty of.] Reference

Power: Rechargeable metal ion battery, nonmandatory AC adapter.    From Wordnik.com.  [Planet Malaysia] Reference

The council also might freeze county hiring, ban most out-of-state travel and eliminate nonmandatory training to help balance the budget.    From Wordnik.com.  [The News Tribune Blogs] Reference

Terwilliger told Bowden and other judges that they shouldn't assume nonmandatory programs such as drug court will be funded after January.    From Wordnik.com.  [HeraldNet.com Local, Sports, Business and Entertainment News] Reference

There is a ease ikon environment of 1920×1080 pixels that dead suits HD tele watch (via an nonmandatory factor cable) and a recording environment that records in HD's 16: 9 ratio and.    From Wordnik.com.  [Planet Malaysia] Reference

Both players have stayed away from all nonmandatory team activities this offseason, and coach Mike Singletary gave no indication either player will arrive a minute sooner than the mandatory minicamp in mid-June.    From Wordnik.com.  [SFGate: Top News Stories] Reference