| Term | Definition |
| didactic | (Adj) teaching; instructional |
| diffuse | (Adj) wrody;rambling; spread out |
| digression | (N) wander away from the subject; off-topic |
| diligence | (N) steadiness of effort; presistent hard work |
| diminution | (N) lessening; reduction in size |
| disband | (V) to break up organization |
| discerning | (Adj) quick to understand |
| disclose | (V) to reaveal |
| discordant | (Adj) not harmonious; conflicting |
| discount | (V) give little or no attention to |
| distant | (Adj) cold in manner; mean |
| divergent | (Adj) separating; moving in different directions from a particular point |
| diverse | (Adj) differing in some characteristics; various |
| divulge | (V) reveal |
| doctrine | (N) a belief, principle or teaching |
| document | (V) provide written evidence |
| dogmatic | (V) opinionated; holding stubbornly to one's opinion; arbitrary |
| dormant | (Adj) not active but capable of becoming active |
| dubious | (Adj) doubtful; questionable |
| duplicity | (N) the act of being two-faced; double-dealing; deception |