Etymology
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ongoing (adj.)

also on-going, "progressing, proceeding, not intermitting," 1877, from on + going.

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onboard (adj.)

"that is on board," 1966 as one word, from the verbal phrase; see on + board (n.2). Originally of spaceships.

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online (adj., adv.)

also on-line, in reference to computers, "directly connected to a peripheral device," 1950; see on + line (n.).

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tachyon (n.)
1967, hypothetical faster-than-light particle, from tachy- "swift" + -on.
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upon (adv.)
Old English upon; see up (adv.) + on (prep.).
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axion (n.)
in quantum physics, 1978, from axial + scientific suffix -on.
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hereon (adv.)
Old English heron "upon this;" see here + on.
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pion (n.)

type of subatomic particle, 1951, from Greek letter pi + -on.

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oncoming (adj.)

"approaching, nearing," 1834, from on + coming, present participle of come (v.). Oncome (n.) "initial stages, onset" (of an effort, rain, snow, a disease, etc.) is from late 12c.

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virion (n.)
coined in French, 1959, from virus (see virus) + -on.
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