- regualar submanifold
- regular base
- regular BCI algebra
- regular bipyramid
- regular block design
- regular Borel measure
- regular boundary point
- regular cardinal number
- regular cardinals
- regular character
- regular circular cone
- regular circular cone
- regular circular cylinder
- regular closed set
- regular conditional distribution
- regular conditional probability
- regular cone
- regular continued fraction
- regular covering space
- regular curve
- regular decomposition of Pontriakin space
- regular dodecahedron
- regular domain
- regular dominant integral weight
- regular economy