Pi is a number, approximately 3.142, which is equal to the distance round a circle divided by its width. It is usually represented by the Greek letter π.
pi in British English1
(paɪ)
nounWord forms: pluralpis
1.
the 16th letter in the Greek alphabet (Π, π), a consonant, transliterated as p
2. mathematics
a transcendental number, fundamental to mathematics, that is the ratio of the circumference of a circle to its diameter. Approximate value: 3.141 592…; symbol: π
Word origin
C18 (mathematical use): representing the first letter of Greek periphereiaperiphery
pi in British English2
or pie (paɪ)
nounWord forms: pluralpies
1.
a jumbled pile of printer's type
2.
a jumbled mixture
verbWord forms: pies, piing, pied, pies, pieing or pied(transitive)
3.
to spill and mix (set type) indiscriminately
4.
to mix up
Word origin
C17: of uncertain origin
pi in British English3
(paɪ)
adjective
British slang short for pious (sense 2), pious (sense 3)
PI in British English
abbreviation for
1.
Philippine Islands
2.
private investigator
PI in American English
Slang
private investigator
pi in American English1
(paɪ)
nounWord forms: pluralpies
1.
a mixed, disordered collection of printing type
2.
any jumble or mixture
verb transitiveWord forms: pied, ˈpieing or ˈpiing
3.
to make jumbled; mix up (type)
Word origin
see pie2
pi in American English2
(paɪ)
noun
1.
the sixteenth letter of the Greek alphabet (Π, π)
2.
a.
the symbol (π) designating the ratio of the circumference of a circle to its diameter
b.
the ratio itself, equal to 3.14159265+: often approximated as 22⁄7
Word origin
Gr pi, earlier pei < Sem, as in Heb pē
Word lists with
pi
Greek
All related terms of 'pi'
carpometacarpus
a bone in the wing of a bird that consists of the metacarpal bones and some of the carpal bones fused together
Hopi
a member of a Native American people of NE Arizona
pipi
any of various shellfishes , esp Plebidonax deltoides of Australia or Mesodesma novae-zelandiae of New Zealand
Tupi
a member of an indigenous South American people of Brazil and Paraguay
pi-dog
a wild Asian dog, often roaming in packs in and around villages
pi meson
→ pion
pi character
any special character, such as an accent or mathematical symbol, which is not normally obtained in a standard type fount
pariah dog
an ownerless half-wild Asian dog
pie-dog
an ownerless half-wild Asian dog
pye-dog
an ownerless half-wild Asian dog
pion
a meson having a positive or negative charge and a rest mass 273.13 times that of the electron , or no charge and a rest mass 264.14 times that of the electron