Vocabulary Words
Download the English Vocabulary Learner Windows Appoptimistic
B2adjective
Allowing other processes to perform transactions on the same data at the same time, and checking for conflicts only when changes need to be written back. (+1 more)
option
B1noun, verb
A contract giving the holder the right to buy or sell an asset at a set strike price (+5 more)
optional
B2adjective, noun
(sometimes capitalized) In various programming languages, a kind of variable that is assigned a specific data type but may or may not hold an actual value. (+4 more)
or
A1adjective, adverb, conjunction, noun, preposition
(operations) The application of scientific methods and techniques to problems of decision making, especially in business management and government administration. (+17 more)
orange
A1adjective, noun, verb
An evergreen tree of the genus Citrus such as Citrus sinensis. (+11 more)
orbit
B1noun, verb
A circular or elliptical path of one object around another object, particularly in astronomy and space travel. (+14 more)
orchestra
B1noun
A large group of musicians who play together on various instruments, usually including some from strings, woodwind, brass and/or percussion (+3 more)
order
A1noun, verb
(chiefly plural) An ecclesiastical grade or rank, as of deacon, priest, or bishop (+46 more)
orderly
B1adjective, adverb, noun
A hospital attendant given a variety of non-medical duties. (+14 more)
organ
B1noun, verb
(by extension) A body of an organization dedicated to the performing of certain functions. (+7 more)
organic
B1adjective, noun
(of search results) Generated according to the ranking algorithms of a search engine, as opposed to paid placement by advertisers. (+15 more)
organism
B1noun
(by extension) Any complex thing with properties normally associated with living things. (+1 more)
organizer
B2noun
A group of cells that, together with the evocator, control differentiation in the embryo (+4 more)