All 3 Uses

atom
in
Nature, by Emerson
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Spirit that lurks each form within Beckons to spirit of its kin; Self-kindled every atom glows, And hints the future which it owes.†
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atom = the smallest part of any material that cannot be broken up by chemical means
Yet all must come, as surely as the first atom has two sides.†
That famous aboriginal push propagates itself through all the balls of the system, and through every atom of every ball, through all the races of creatures, and through the history and performances of every individual.†

Definitions:

(1) (atom)
the smallest part of any material that cannot be broken up by chemical means; comprised of a nucleus of protons and neutrons surrounded by orbiting electrons
(2) (meaning too rare to warrant focus)