In Common Usage. emphases is one of the 10000 most commonly used words in the Collins dictionary.
structure. n. 1. a complex construction or entity. 2. the arrangement and interrelationship of parts in a construction, such as a building. 3. the manner of construction or organization: the structure of society.
Chemistry: A Definition. Chemistry is the study of matter, including its composition, properties, and structure, how it changes, and how it interacts with energy. This is a pretty simple definition that sums up what is actually a complex and fascinating subject.