English Vocabulary
Pick a CEFR level (A1–C2) — A1 is the friendliest place to start — and browse its words grouped by topic: travel, food, the body, emotions, and more. Each word shows its meaning, example sentences, and US/UK pronunciation.
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257 words
concavity
C2
/kənˈkævəti/
the quality or state of curving inward; the property of being concave
diametric
C2
/ˌdaɪəˈmɛtɹɪk/
completely or directly opposite; usually used in the phrase diametric opposite
invariant
C2
/ˌɪnˈvɛriːənt/
Unaffected by a specified operation, especially by a transformation.
potentiometer
C2
/pəˌtɛn(t)ʃiˈɑmɪtəɹ/
a measuring instrument for measuring direct current electromotive forces
numeration
C2
/ˌnuːməˈreɪʃən/
the act or process of counting or assigning numbers
covariant
C2
/koʊˈvɛriənt/
changing or transforming in a corresponding way under a change of coordinates or type relation
congruity
C2
/kənˈɡruəti/
agreement, consistency, or suitability between things
calorimeter
C2
/ˌkæl.əˈɹɪm.ə.t̬ɚ/
an instrument for measuring heat absorbed or released during a chemical reaction, phase change, or other physical process
quincunx
C2
/ˈkwɪŋkʌŋks/
An arrangement of five units with four forming the corners of a square and the fifth at the centre of the square, a pattern corresponding to the five-spot on dice, playing cards, or dominoes
sequent
C2
/ˈsiː.kwənt/
in proof theory, a formal expression showing that one or more conclusion formulas follow from a collection of premise formulas
inexactitude
C2
/ˌɪnɪɡˈzæktəˌtuːd/
lack of exactness, accuracy, or precision
hairbreadth
C2
/ˈhɛɹˌbɹɛdθ/
an extremely small distance, amount, or margin; literally, the width of a hair
collinear
C2
/kəˈlɪn.i.ɚ/
lying on the same line
reprobation
C2
/ˌɹɛpɹəˈbeɪʃən/
The act of reprobating; the state of being reprobated; strong disapproval, reproof or censure.
ordinal
C2
/ˈɔɹ.dɪ.nəl/
being or denoting a numerical order in a series
exponentiation
C2
/ˌek.spoʊˌnen.ʃiˈeɪ.ʃən/
the mathematical operation of raising a base to a power specified by an exponent
agio
C2
/ˈæ.d͡ʒoʊ/
The premium or percentage on a better sort of money when it is given in exchange for an inferior sort. The premium or discount on foreign bills of exchange is sometimes called agio.
congruence
C2
/ˈkɑŋɡruəns/
agreement, correspondence, or consistency between things
triadic
C2
/traɪˈædɪk/
consisting of three elements or involving a three-place relation
dimorphism
C2
/daɪˈmɔrfɪzəm/
The occurrence in an animal species of two distinct types of individual.
affine
C2
/əˈfaɪn/
Of or pertaining to a function expressible as f(⃑x)=A⃑x+⃑b (where A is a linear transformation and ⃑b is a constant), which, regarded as a transformation, maps parallel lines to parallel lines and finite points to finite points.
finitely
C2
/ˈfaiːnaiʔ.li/
with a finite limit
kilovolt
C2
/ˈkɪləˌvoʊlt/
one thousand volts. Symbol: kV or KV.
correlator
C2
/ˈkɔr.əˌleɪ.tɚ/
something that correlates two sets of things; in logic, a relation that pairs terms in one field with terms in another
ellipsoid
C2
/ɪˈlɪp.sɔɪd/
a surface whose plane sections are all ellipses or circles
incommensurable
C2
/ˌɪnkəˈmɛnʃɚəbəl/
in mathematics, lacking a shared unit that measures each quantity exactly; having an irrational ratio
arithmetician
C2
/əˌɹɪθməˈtɪʃən/
a person who is skilled in or specializes in arithmetic
multiplicative
C2
/ˈmʌltɪplɪˌkeɪtɪv/
tending or having the power to multiply or increase in number or quantity or degree
transfinite
C2
/tɹænsˈfaɪnaɪt/
A transfinite number.
approximator
C2
/əˈprɑksəˌmeɪtɚ/
a person, method, or device that produces an approximate value or representation
nonmathematical
C2
/ˌnɑːnˌmæθəˈmætɪkəl/
not involving, expressed in, or based on mathematics
indemonstrable
C2
/ˌɪndɪˈmɑnstrəbəl/
incapable of being demonstrated, proved, or established by an argument
modius
C2
/ˈmoʊdiəs/
an ancient Roman dry measure, especially for grain, equal to about 8.7 liters or 0.96 imperial peck
quadrate
C2
/ˈkwɑːdreɪt/
to agree, correspond, or fit exactly with something
equiangular
C2
/ˌiːkwiˈæŋɡjələr/
having all its angles equal, or having corresponding angles equal
contravariant
C2
/ˌkɑntrəˈvɛriənt/
transforming in an opposite or reverse way under a change of coordinates or type relation
commensurable
C2
/kəˈmɛnʃɚəbəl/
in mathematics, measurable by the same unit without a fractional remainder; having a rational ratio
perpendicularity
C2
/ˌpɝpənˌdɪkjuˈlɛrəti/
the state or relation of meeting a line or plane at a right angle
rhombic
C2
/ˈrɑmbɪk/
having the shape or characteristics of a rhombus, with four equal sides and opposite angles equal
pyrometer
C2
/paɪˈrɑmətər/
a thermometer designed to measure high temperatures
dimensionless
C2
/dɪˈmɛnʃənləs/
having no physical units or measurable dimensions
indivisibility
C2
/ˌɪndəˌvɪzəˈbɪləti/
the state or property of being incapable of division
non-Euclidean
C2
/ˌnɑn juˈklɪdiən/
not based on Euclidean geometry, especially geometry in which Euclid's parallel postulate does not hold
commutative
C2
/kəˈmjutətɪv/
having the property that changing the order of operands does not change the result
collinearity
C2
/kəˌlɪniˈærəti/
the condition of lying on the same straight line
well-ordered
C2
/ˌwɛlˈɔrdərd/
arranged according to a clear order; in mathematics, ordered so every nonempty subset has a first element
covariance
C2
/koʊˈvɛriəns/
the way two quantities vary together; in mathematics and statistics, a measure or transformation property of such variation
contravariance
C2
/ˌkɑntrəˈvɛriəns/
opposite-direction variation or transformation, especially in tensors, category theory, or type systems
four-dimensional
C2
/ˌfɔr dəˈmɛnʃənəl/
having or involving four dimensions, especially three spatial dimensions plus time
first-order
C2
/ˌfɜrstˈɔrdər/
belonging to the first level, degree, or order; in logic, quantifying over individuals rather than predicates
second-order
C2
/ˌsɛkəndˈɔrdər/
belonging to the second level or order; in logic, quantifying over predicates or sets
three-term
C2
/ˈθriˌtɜrm/
involving three terms or elements
quasiperiodic
C2
/ˌkwɑː.zaɪˌpɪr.iˈɑː.dɪk/
physics and mathematics: combining two or more incommensurate periods, so that a pattern recurs without repeating after one fixed interval
metrizable
C2
/ˈmɛt.raɪ.zə.bəl/
topology: having a metric that induces the space's given topology
algebraical
C2
/ˌældʒɪˈbreɪɪkəl/
relating to algebra or carried out by algebraic methods; a now less common variant of algebraic
arpent
C2
/ˈɑːr.pənt/
historical: any of several French units of land area, varying by place and still encountered in records from Quebec and Louisiana
subtend
C2
/səbˈtɛnd/
to lie opposite an angle, or to have an angle formed at a point by lines drawn to the ends of an arc, line, or object
juger
C2
/ˈdʒuːɡɚ/
an ancient Roman unit of land area equal to 28,800 square Roman feet, about 0.25 hectare or 0.62 acre
chaldron
C2
/ˈtʃɔːldrən/
historical: any of several British dry measures, especially a coal measure varying locally from about 32 to 72 imperial bushels
sesquialtera
C2
/sɛskwɪˈaltərə/
in mathematics or musical theory, the ratio 3:2, in which one quantity is one and a half times another
connexity
C2
/kəˈnɛk.sə.ti/
in logic and order theory, the property of a relation whereby any two distinct relevant terms are related in one direction or the other
handbreadth
C2
/ˈhændˌbrɛdθ/
a unit or distance equal to the breadth of a hand, roughly four inches or ten centimetres
arithmetization
C2
/əˌrɪθmətəˈzeɪʃən/
the treatment of mathematics or another formal system by methods involving only the fundamental concepts and operations of arithmetic
rhomb
C2
/rɑːm/
a rhombus; a parallelogram whose four sides are equal
rectilineal
C2
/ˌrɛktəˈlɪniəl/
formed by, bounded by, or moving in straight lines