in or to a high degree; extremely: highly amusing; highly seasoned food.
with high appreciation or praise; admiringly: to speak highly of a person.
more than adequately; generously: a highly paid consultant.

before 900; Middle English heihliche, Old English hēalīce. See high, -ly

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World English Dictionary
highly (ˈhaɪlɪ)
1.  (intensifier): highly pleased; highly disappointed
2.  with great approbation or favour: we spoke highly of it
3.  in a high position: placed highly in class
4.  at or for a high price or cost

Collins English Dictionary - Complete & Unabridged 10th Edition
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Slang Dictionary


adv. [scientific computation] The preferred modifier for overstating an understatement. As in: `highly nonoptimal', the worst possible way to do something; `highly nontrivial', either impossible or requiring a major research project; `highly nonlinear', completely erratic and unpredictable; `highly nontechnical', drivel written for lusers, oversimplified to the point of being misleading or incorrect (compare drool-proof paper). In other computing cultures, postfixing of in the extreme might be preferred.
Example sentences
Sturgeons are highly regarded, both commercially for their caviar and meat, and
  for sport.
The highly social and complex world of ants is not void of selfish acts.
Ozone is a form of oxygen: a highly poisonous, pale blue gas with a strong odor.
Explain to students that the study of human origins is highly complex.
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