Vocabulary Words
recycling
B1noun, verb
The practice of sorting and collecting waste materials for new use. (+6 more)
reduction
B1noun
(computability theory) a transformation of one problem into another problem, such as mapping reduction or polynomial reduction. (+9 more)
reef
B1adjective, noun, verb
(of paddles) To move the floats of a paddle wheel toward its center so that they will not dip so deeply. (+12 more)
reference
B2noun, verb
(academic writing) A previously published written work thus indicated (+18 more)
refinery
B2noun
A building, or a mass of machinery, used to produce refined products such as sugar, oil, or metals.
reform
B2noun, verb
The change of something that is defective, broken, inefficient or otherwise negative, in order to correct or improve it (+6 more)
refrain
B2noun, verb
(with preposition "from") To stop oneself from some action or interference (+9 more)
refresh
B2noun, verb
The periodic energizing required to maintain the contents of computer memory, the display luminance of a computer screen, etc. (+10 more)