This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. The process of becoming less active or severe

n. A sinking of something to a lower level, especially of part of the surface of the Earth due to underground excavation or seismic activity

n. The act or process of subsiding.

n. The act or process of subsiding, in any sense of the verb subside.

n. Synonyms Ebb, decrease, diminution, abatement.

n. a gradual sinking to a lower level

n. an abatement in intensity or degree (as in the manifestations of a disease)

n. the sudden collapse of something into a hollow beneath it

"While subsidence is certainly a piper that must ultimately, one day, be paid, we have to think about these things on appropriate timelines."

subsidency   

sinking    collapse   

guidance   

denudation    assuagement    sedimentation    shading    inundation    weaken    diminution    upheaval    shrinkage    erosion