a round, thick root of some plants

globular object

things contained in something

elements of larger object

a (usually hard) center (with seeds) of such fruits is the apple and pear

center, gist

the part (of a problem) that is the most difficult to solve

most important part

the nature or most important quality (of something)

heart, significance

the act of establishment (a university, church etc); a strong base of a building, on which it is built

basis for something physical or mental

the softer, inner part (of a hut or fruit-stone); an inside part of a seed, e.g. a grain of wheat

seed, essence

a round handle of a door, drawer etc; a round control of a radio, television etc

lump, handle

a bar passed through the end of an axle to keep the wheel in position; a person who keeps a business, organization etc successful

essence, theme

nucleus

core; basis for something's

the central part of an atom, consisting of protons and neutrons; a central part, round which other parts are grouped or round which other things collect

core; basis for something's

the general meaning or intention of something said or written; to seem to mean (something); to claim (something)

meaning, implication

the part of a plant, tree etc in the ground and which takes water and food from the soil

base, core

short trousers ending above the knees, as worn by children, by adults for games etc

core, gist

a special meaning, importance

meaning

basic; hidden but able to be found

fundamental, latent