Key vocabulary words with IPA pronunciation, definitions, example sentences, and interactive quizzes.
Phrases with type tags, bilingual definitions, usage notes, and example sentences.
To extend the limits of what is possible or known.
To assume control or responsibility for something.
To overcome obstacles or prejudices that prevent progress.
A sudden and very sad event happened.
The highest university degree that is conferred after a course of study and research in any field, not just philosophy.
Pure substances consisting of atoms that all have the same number of protons; the primary constituents of matter.
Streams of particles or electromagnetic waves emitted by a radioactive substance.
A formal job or rank within an institution, especially in academia.