- irrational function
- irrational invariant
- irrational number
- irrationaliness
- irrationalise
- irrationality
- irrationalize
- irrationally
- irrebuttable
- irreclaimability
- irreclaimable
- irreclaimableness
- irrecocilability
- irrecognizable
- irreconcilability
- irreconcilable
- irreconcilableness
- irreconcilably
- irrecoverable
- irrecoverable debt
- irrecoverable error
- irrecoverableness
- irrecoverably
- irrecusable
- irredeemable
- irredeemable bond
- irredeemable currency
- irredeemable stock
- irredeemableness
- irredeemables
- irredeemably
- irredentism
- irredentist
- irreducibility
- irreducible
- irreducible character
- irreducible continuum
- irreducible correspondence
- irreducible curve
- irreducible element
- irreducible equation
- irreducible fraction
- irreducible group
- irreducible polynomial
- irreducible representation
- irreducible saturation
- irreducible variety
- irreducible water
- irreducibleness
- irreducibly
- irreducibly connected
- irredundant
- irreflective
- irreflective relation
- irreflexive
- irreflexive relation
- irreformable
- irrefragability
- irrefragable
- irrefragableness
- irrefrangible
- irrefutability
- irrefutable
- irrefutable formula
- irrefutableness
- irrefutably
- irregardless
- irregular
- irregular curve
- irregular cut
- irregular discharge
- irregular edge
- irregular figure
- irregular firing
- irregular fluctuation
- irregular nebula
- irregular pitch
- irregular plan
- irregular polygon
- irregular polyhedron
- irregular series
- irregular settlement
- irregular shape
- irregular temperature
- irregular ventilation
- irregular yarn
- irregularity
- irregularly
- irrelative
- irrelativeness
- irrelevance
- irrelevancy
- irrelevant
- irrelevantly
- irrelievable
- irreligion
- irreligionist
- irreligiosity
- irreligious
- irreligiousness