ecotone

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eco•tone from _eco_logy (eco; Greek οἶκος, oikos “house/dwelling”) + -tone from the Greek τόνος tonos, “tension.”

https://www.esa.org/esablog/about/ecotone-explained/#:~:text=eco%E2%80%A2tone%20from%20ecology,a%20new%20and%20different%20community.

Examples

• when you wake up between dreaming and waking
• dawn
• dusk
• when the moon rises