- electronic plane-table
- electronic total station
- electron pair annihilation neutrino process
- electro-optical distance measuring instrument
- elegant graph
- elegant labeling
- element
- elementarily equivalent
- elementary Abelian group
- elementary algebra
- elementary cardinal number
- elementary catastrophe
- elementary chain
- elementary class
- elementary diagram
- elementary embedding
- elementary event
- elementary event
- elementary extension
- elementary extension principle
- elementary factor group of matrices
- elementary factor of a linear transformation
- elementary factor of matrices
- elementary fixed point
- elementary function