An ergometer (rowing machine).
"The chair's ergonomics were so well designed that I could work for hours without any back pain."
An ergonomic factor or characteristic.
(used as a sentence connector) therefore or consequently
"He missed the bus, and so he arrived late at work, ergo his presentation was rushed."
Consequently, therefore, or thus.
"The data showed a sharp decline in sales; ergo, we must cut production costs immediately."
therefore (especially in syllogisms)
"If all mammals are warm-blooded and whales are mammals, ergo whales are warm-blooded."