Hypertext Webster Gateway: "supplementing"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Supplement \Sup"ple*ment\, v. t. [imp. & p. p. {Supplemented};
p. pr. & vb. n. {Supplementing}.]
To fill up or supply by addition; to add something to.
Causes of one kind must be supplemented by bringing to
bear upon them a causation of another kind. --I.
Taylor.
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