D.C. Mun. Regs. tit. 5-E, § 2799
2799.1 When used in this chapter, the following terms and phrases shall have the meanings ascribed:
Approved School Accident Insurance - insurance either contracted for or approved by D.C. Public Schools.
Day - one (1) calendar day, unless otherwise stated.
League - an association of sports teams or clubs that compete mainly among themselves.
Participate- to play in practice games or scrimmages, wear the team uniform, take pictures with the team, or engage in any other actions other than those of a spectator.
Week - seven (7) calendar days.
SOURCE: Final Rulemaking published at 38 DCR 5659, 5664 (September 6, 1991).