Definitions
American Heritage® Dictionary of the English Language, Fourth Edition
Century Dictionary and Cyclopedia
- Therefore: used technically in logic to introduce the conclusion of a complete and necessary syllogism.
Wiktionary
- adv. Consequently, therefore.
- conj. therefore (especially in syllogisms).
GNU Webster's 1913
- Therefore; consequently; -- often used in a jocular way.
WordNet 3.0
- adv. (used as a sentence connector) therefore or consequently
Etymologies
- Latin ergō; see reg- in Indo-European roots.
Examples
“The other day I left a post-it note for my husband that had the word "ergo" on it.”
“Pretentious enough to use the word ergo when he’s making a threat.”
“21 Jul 2009 by Emily R my problem with the ergo is getting the baby in the back. we gave it back to the friend who lent it to us and are using a hiking backpack. what is the advantage of this carrier over a traditional backpack?”
“My observation on the ergo is that Dads love it, and moms start to love it once their kids are over 20 lbs, and will then use them until they’re 4 or 5.”
“Contains first use of the phrase cogito ergo sum.”
“Practically every traditional tomato sauce uses oregano, ergo, that is almost all varieties of pizza and a ton of pasta dishes.”
“Critics say there's no "ergo" about it, and that the conclusion that Oswald was the lone assassin forced the commission into a scenario out of Rube Goldberg.”
“All men will believe on him"; ergo, "the Romans will come," &c. I.”
“If then there be a mere 'pæna damni', that is, the not being so blest as some others may be; this is a different state 'in genere' from the 'pæna sensus': 'ergo', not hell; 'ergo' rather a third state; or else heaven.”
“All stones are men: all men think: 'ergo', all stones think.”
Lists
These user-created lists contain the word ‘ergo’.
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Daily Words
The words I come across on Daily basis that I feel Important to know
daily words, lackluster, mala fide, nepotism, avarice, polemics, fervor, ergo, precarious, reprieve, undefiled
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Dead (or dying) English Words
Inspired by the an old New York Times article and the Dictionary of Dying Danish Words list here on Wordie.
chorine, terpsichore, motorcar, motoring, centigrade, maven, tautology, pleonasm, contrariwise, spatchcock, mascaron, miasma and 29 more...
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Latin Words Used in English
Latin words, phrases, or abbreviations still used in modern English.
et cetera, ad hoc, post scriptum, id est, semper fidelis, semper paratus, veritas, vice versa, ergo, modus operandi, status quo, exempli gratia and 6 more...

uselessness Wouldn't bother me a mite. This word is chock full of hot airgo. Dec 18, 2007
bilby You want this to fall into disuse, uselessness? Wherego ergo? Dec 18, 2007
mariekip I really just like how this sounds. Dec 18, 2007
uselessness Truly one of the most pretentious words I know. Stick with therefore or thus; they're bad but not as bad. Jan 25, 2007
oroboros Ogre in reverse! Jan 25, 2007
sonofgroucho As in "Cogito ergo sum". Jan 25, 2007