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Leo

[lee-oh]
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noun, genitive Le·o·nis [lee-oh-nis] /liˈoʊ nɪs/ for 1.
  1. Astronomy. the Lion, a zodiacal constellation between Virgo and Cancer, containing the bright star Regulus.
  2. Astrology.
    1. the fifth sign of the zodiac: the fixed fire sign.
    2. a person born under this sign, usually between July 23rd and August 22nd.
  3. a male given name: from a Greek word meaning “lion.”
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Leo I

[lee-oh; Italian le-aw]
noun
  1. Saint,Leo the Great, a.d. c390–461, Italian ecclesiastic: pope 440–461.
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Leo II

noun
  1. Saint,died a.d. 683, Sicilian ecclesiastic: pope 682–683.
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Leo III

noun
  1. Saint, a.d. c750–816, Italian ecclesiastic: pope 795–816.
  2. (“the Isaurian”), a.d. c680–741, Eastern Roman emperor 717–741.
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Leo IV

noun
  1. Saint,died a.d. 855, Italian ecclesiastic: pope 847–855.
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Leo V

noun
  1. flourished 10th century a.d., Italian ecclesiastic: pope 903.
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Leo VI

noun
  1. pope a.d. 928.
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Leo VII

noun
  1. died a.d. 939, Italian ecclesiastic: pope 936–939.
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Leo VIII

noun
  1. died a.d. 965, Italian ecclesiastic: pope 963–965.
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Leo IX

noun
  1. SaintBruno, 1002–54, German ecclesiastic: pope 1049–54.
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Leo X

noun
  1. Giovanni de'Medici, 1475–1521, Italian ecclesiastic: pope 1513–21 (son of Lorenzo de'Medici).
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Leo XI

noun
  1. Alessandro de'Medici, 1535–1605, Italian ecclesiastic: pope 1605.
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Leo XII

noun
  1. Annibale Francesco della Genga, 1760–1829, Italian ecclesiastic: pope 1823–29.
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Leo XIII

noun
  1. Giovanni Vincenzo Pecci, 1810–1903, Italian ecclesiastic: pope 1878–1903.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for leo

Leo1

noun
  1. a name for a lion, used in children's tales, fables, etc
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Word Origin

from Latin: lion

Leo2

noun Latin genitive Leonis (liːˈəʊnɪs)
  1. astronomy a zodiacal constellation in the N hemisphere, lying between Cancer and Virgo on the ecliptic, that contains the star Regulus and the radiant of the Leonid meteor shower
  2. astrology
    1. Also called: the Lionthe fifth sign of the zodiac, symbol ♌, having a fixed fire classification and ruled by the sun. The sun is in this sign between about July 23 and Aug 22
    2. a person born during a period when the sun is in this sign
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adjective
  1. astrology born under or characteristic of Leo
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Also (for senses 2b, 3): Leonian (liːˈəʊnɪən)

LEO

abbreviation for
  1. low earth orbit
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Leo I

noun
  1. Saint, known as Leo the Great. ?390–461 ad, pope (440–461). He extended the authority of the papacy in the West and persuaded Attila not to attack Rome (452). Feast day: Nov 10 or Feb 18
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Leo III

noun
  1. called the Isaurian. ?675–741 ad, Byzantine emperor (717–41): he checked Arab expansionism and began the policy of iconoclasm, which divided the empire for the next century
  2. Saint. ?750–816 ad, pope (795–816). He crowned Charlemagne emperor of the Romans (800). Feast day: June 12
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Leo IX

noun
  1. Saint, original name Bruno of Egisheim. 1002–54, pope (1049–54): first of the great medieval reforming popes. Conflict with the Eastern Church led to the schism between Rome and Constantinople (1054). Feast day: April 19
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Leo XIII

noun
  1. original name Gioacchino Pecci. 1810–1903, pope (1878–1903). His many important encyclicals include Rerum novarum (1891) on the need for Roman Catholics to take action on various social problems
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Leo X

noun
  1. original name Giovanni de' Medici. 1475–1521, pope (1513–21): noted for his patronage of Renaissance art and learning; excommunicated Luther (1521)
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for leo

Leo

zodiac constellation, late Old English, from Latin leo "lion" (see lion). Meaning "person born under the sign of Leo" is from 1894. Leonid "meteor which appears to radiate from Leo" is from 1868. The annual shower peaks Nov. 14.

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Online Etymology Dictionary, © 2010 Douglas Harper

leo in Science

Leo

[lēō]
  1. A constellation in the Northern Hemisphere near Cancer and Virgo. Leo (the Lion) contains the bright star Regulus and is the fifth sign of the zodiac.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.