definition of
core

[1] #1 core n. [nucleus, core group] a small group of indispensable persons or things; "five periodicals make up the core of their publishing program". wn

[2] #2 core n. the center of an object; "the ball has a titanium core". wn

[3] #3 core n. the central part of the Earth. wn

[4] #4 core n. [kernel, substance, center, centre, essence, gist, heart, heart and soul, inwardness, marrow, meat, nub, pith, sum, nitty-gritty] the choicest or most essential or most vital part of some idea or experience; "the gist of the prosecutor's argument"; "the heart and soul of the Republican Party"; "the nub of the story". wn

[5] #5 core v. remove the core or center from; "core an apple". wn