background (noun) — sense 3

A part of the picture that depicts scenery to the rear or behind the main subject; context.

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Example
Earless ghost swift moths become “invisible” to echolocating bats by forming mating clusters close[…]above vegetation and effectively blending into the clutter of echoes that the bat receives from the leaves and stems around them. Many insects probably use this strategy, which is a close analogy to crypsis in the visible world — camouflage and other methods for blending into one’s visual background.
Order number
3
Part of speech
noun

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