- infinity
- inflection point
- inflectionless
- inflexional
- injection
- inner multiplication
- inner point
- inscribable
- integrate
- integrator
- integer
- integral
- integrand
- integration
- inner product
- insribableness
- insribe
- integrability
- intercept
- interpolate
- interpolation
- intersect
- intersection
- intersectional
- interval
- intervallic
- into
- invalid
- invariable
- invariant
- inverse
- inversion
- involute
- involution
- irreducibleness
- irrational
- irreducibility
- irreducible
- isogon
- isogonal
- isogonic
- isomorphic
- isomorphism
- isomorphous
- isoperimetric
- isoperimetrical
- isosceles
- iterate
- least
- lemma
- let
- lemmata
- lemniscate
- linear
- local
- locus
- loci
- logarithm
- logistics
- loxodrome
- lune
- mapping
- mantissa
- map
- matrices
- mean
- meant
- measure
- median
- menruration
- metacentre
- metacentric
- metacenter
- mixed
- minus sign
- minute
- minus
- metric
- multiple
- multiply
- mulinomial
- multiplicand
- multiplication
- multiplier
- n
- naught
- negative
- node
- normal
- nought
- numerator
- null
- oblate
- obtuse
- obtuseness
- octagon
- octahedral
- octahedron
- octangle
- octangular