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English Words Starting With R

5,802 entries — pick a word to see its definition, pronunciation, and usage.

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Noun Verb Adjective Adverb Plural noun Combining form Verb (transitive)Verb (intransitive)Verb (ambitransitive)

relative humidity
nounIntermediate (B2)
/ˌrel.ə.tɪv hjuːˈmɪd.ə.ti/The amount of water vapour present in air expressed as a percentage of the amount needed for saturation at the same temperature.
relative impediment
nounC1/C2
/ˈrɛl.ə.tɪv ɪmˈpɛd.ɪ.mənt/An obstacle or hindrance whose significance is not absolute but is judged in comparison to other factors or circumstances.
relative major
nounLow
/ˈrɛl.ə.tɪv ˈmeɪ.dʒə/The major key that shares the same key signature as a given minor key, located a minor third higher.
relative majority
nounC1
/ˈrɛl.ə.tɪv məˈdʒɒr.ə.ti/In an election, more votes than any other single candidate or option, but not necessarily more than half of all votes cast.
relative minor
nounLow
/ˈrɛl.ə.tɪv ˈmaɪ.nə/In music theory, the minor key that shares the same key signature as a given major key, located a minor third below the tonic of that major key.
relative molecular mass
nounC1/C2
/ˈrɛl.ə.tɪv məˈlɛk.jə.lə mæs/The ratio of the average mass of one molecule of a substance to one twelfth of the mass of an atom of carbon-12.
relative permeability
nounC2
/ˈrɛl.ə.tɪv ˌpɜː.mi.əˈbɪl.ə.ti/The ratio of the effective permeability of a fluid in porous material to the absolute permeability of that material.
relative permittivity
nounC2
/ˈrɛl.ə.tɪv ˌpɜː.mɪˈtɪv.ɪ.ti/A dimensionless number that measures how much an electric field is reduced within a material compared to a vacuum.
relative pitch
nounC1/C2
/ˈrel.ə.tɪv pɪtʃ/The ability to identify or reproduce a musical note based on its relationship to a reference tone, rather than absolute pitch memory.
relative pronoun
nounmedium
/ˈrel.ə.tɪv ˈprəʊ.naʊn/A pronoun that introduces a relative clause, referring back to an antecedent noun or pronoun.
relative topology
nounLow in general usage, but high in academic mathematics.
/ˈrɛl.ə.tɪv təˈpɒl.ə.dʒi/In topology, the topology induced on a subset of a topological space by restricting the open sets of the larger space to the subset.
relative wind
nounVery low frequency in general English; High frequency in technical contexts (aviation, sailing, aerodynamics).
/ˌrɛl.ə.tɪv ˈwɪnd/The direction and speed of airflow experienced by a moving object (aircraft, vehicle, or person), as opposed to the true wind direction felt by a stationary observer.
relatively prime numbers
plural-nounC1
/ˌrɛl.ə.tɪv.li ˈpraɪm ˈnʌm.bəz/Two or more integers that share no common positive divisor other than 1.
relativeness
nounC1/C2 (low frequency, academic/philosophical)
/ˈrɛl.ə.tɪv.nəs/The quality or state of being relative; existing or possessing meaning only in relation to something else.
relativism
nounC2
/ˈrɛl.ə.tɪ.vɪ.zəm/The doctrine that knowledge, truth, or morality is not absolute but depends on the perspective of the individual or cultural context.
relativist
nounC1/C2
/ˈrɛl.ə.tɪ.vɪst/A person who believes that truth, morality, or knowledge are not absolute but depend on context, perspective, or culture.
relativistic mass
nounC2
/ˌrel.ə.tɪˈvɪs.tɪk mæs/The apparent increase in the mass of an object as its velocity approaches the speed of light, a concept from Einstein's special theory of relativity.
relativistic quantum mechanics
nounVery low (specialist term)
/ˌrɛl.ə.tɪˈvɪs.tɪk ˈkwɒn.təm mɪˈkæn.ɪks/A theoretical framework in physics that combines the principles of quantum mechanics with the special theory of relativity, necessary for accurately describing particles moving at speeds comparable to the speed of light.
relativity
nounC1
/ˌrɛl.əˈtɪv.ə.ti/The state or quality of being relative, dependent on something else.
relativize
verbverb-transitiveC1-C2
/ˈrel.ə.tɪ.vaɪz/To view or make something relative rather than absolute; to treat something as dependent on a particular context, perspective, or framework.

Showing 2321–2340 of 5802 words.