erode - Dictionary definition and pronunciation - Yahoo! Education
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rationale
Definition: (noun) an underlying reason or explanation.
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e·rode  audio  (-rd) KEY 

VERB:
e·rod·ed, e·rod·ing, e·rodes
VERB:
tr.
  1. To wear (something) away by or as if by abrasion: Waves eroded the shore.
  2. To eat into; corrode.
  3. To make or form by wearing away: The river eroded a deep valley.
  4. To cause to diminish or deteriorate as if by eating into or wearing away: "Long enduring peace often erodes popular resolution" (C.L. Sulzberger).
VERB:
intr.
To become worn or eaten away: The cliffs have eroded over the centuries. Public confidence in the administration eroded.

ETYMOLOGY:
Latin rdere, to gnaw off, eat away : -, ex-, ex- + rdere, to gnaw; see rd- in Indo-European roots

OTHER FORMS:
e·rodi·bili·ty(Noun), e·rodi·ble(Adjective)


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