Might mean (unverified): Reaction proceeds without energy barrier.
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We found one dictionary that defines the word activationless:

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  1. activationless: Wiktionary

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Definitions from Wiktionary (activationless)

▸ adjective:  (physical chemistry, physics) Having an activation energy near 0

Similar:
chargeless, energyless, reactionless, inductionless, fluxless, inertialess, momentless, massless, acceptorless, atomless, more...

Opposite:
activated, energized, stimulated, excited, aroused

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Similar:
chargeless, energyless, reactionless, inductionless, fluxless, inertialess, momentless, massless, acceptorless, atomless, more...

Opposite:
activated, energized, stimulated, excited, aroused



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