"made firm, solid, hard, or compact," 1736, past-participle adjective from consolidate. Of bills in parliament, 1741; of money, debt, etc., 1753.
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consolidate v.
1510s, "to combine into one body," from Latin consolidatus, past participle of consolidare "to make solid," from assimilated form of com "with, together" (see con-) + solidare "to make solid," from solidus "firm, whole, undivided, entire," from suffixed form of PIE root *sol- "whole."
Meaning "to make firm or strong" is from 1530s; that of "to form into a solid mass" is from 1650s. Intransitive sense "to grow firm or compact" is from 1620s. Caxton (late 15c.) has consolid (v.), from French consolider. Related: Consolidated; consolidating.