# photoactivation

> English word · Noun

## Definitions
1. The absorption of energy from a photon in raising a molecule (or chromophore) from the ground state; especially the first stage of photosynthesis in which energy is absorbed by chlorophyll

## Etymology
From photo- + activation.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/photoactivation