Definition of "ergo"

ergo¹

/ˈɛɚɡoʊ/

adverb
not comparable
1. Consequently, therefore, or thus.
  Quotations
  "I merely made an individual application of a general rule. All women love flattery—ergo, Miss Arundel liked it."
  1831, L[etitia] E[lizabeth] L[andon], chapter III, in Romance and Reality. […], volume III, London: Henry Colburn and Richard Bentley, […], page 59
  The pirates who invaded this fort left Sparrow locked in his cell; ergo, they are not his allies.
  2003, Pirates of the Caribbean:
conjunction
1. therefore (especially in syllogisms)

ergo²

/ˈɛɚɡoʊ/

noun
plural ergos
1. (rowing, slang) Clipping of ergometer (rowing machine).

ergo³

/ˈɛɚɡoʊ/

noun
plural ergos
1. (informal) An ergonomic factor or characteristic.