Plural of depressibility; the plural form of the quality or state of being able to be pressed down or depressed.
From depressible + '-ity' (quality noun suffix) + '-ies' (plural). Built on Latin 'deprimere' meaning to press down, with multiple layers of English suffixes.
This word is so layered with suffixes it's almost a Matryoshka doll of language—each suffix (deprimere→depressible→depressibility→depressibilities) adds another layer of abstraction away from the physical act of pressing.
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