core

definition: 
the central or most important part
sentence: 
The core of curriculum consists of courses that are required of all students.
difficulty: 
very easy
toefl frequency: 
2
toefl classification: 
adverb: 
adjective: 
core
adverb sentence: 
adjective sentence: 
verb: 
verb sentence: 
noun: 
core
noun sentence: