thus
thus W1 /ðʌs/ adverb formal
- [sentence adverb] as a result of something that you have just mentioned
- Most of the evidence was destroyed in the fire. Thus it would be almost impossible
prove him guilty
- in this manner or way
- They diluted the drug, thus reducing its effectiveness
- thus far until now
- Her political career thus far had remained unblemished.
spectrum
spec·trum /ˈspektrəm/ noun (plural spectra /-trə/) [countable]
- a complete range of opinions, people, situations etc, going from one extreme to its opposite
- spectrum of
- the ethnic spectrum of America
- across the spectrum
- The bill drew support from across the political spectrum
- broad/wide/full etc spectrum
- a broad spectrum of environmental groups
- The two articles here represent opposite ends of the spectrum
- the set of bands of coloured light into which a beam of light separates when it is
passed through a prism
- a complete range of radio, sound etc waves
- the electromagnetic spectrum
feat
feat /fiːt/ noun [countable]
something that is an impressive achievement, because it needs a lot of skills, strength
etc to do
- remarkable/considerable/incredible etc feat
- They climbed the mountain in 28 days, a remarkable feat
- feat of
- an incredible feat of engineering
- perform/accomplish/achieve a feat
- the woman who performed the feat of sailing around the world alone
- no mean feat (=something that is difficult to do)
- It is no mean feat to perform such a difficult piece
tyrant
ty·rant /ˈtaɪərənt $ ˈtaɪr-/ noun [countable]
- a ruler who has complete power and uses it in a cruel and unfair way
- The country had long been ruled by tyrants
- someone who has power over other people, and uses it cruelly or unfairly
- My headmaster was a real tyrant
den
den /den/ noun [countable]
- the home of some animals, for example lions or foxes
- a place where secret or illegal activities take place
- corrupt gambling dens
- a den of thieves
- an enclosed and secret place where children play
- especially American English a room in a house where people relax, watch television etc
- British English old-fashioned a small room in a house where people can work, read etc
without being interrupted
- Father retreated to his den
- den of iniquity a place where activities that you think are immoral or evil happen -
often used humorously
- Her mother was convinced that London was a den of iniquity.
Reference
- Longman Dictionary of Contemporary English