The Collaborative International Dictionary of English v.0.48:
Abate \A*bate"\ ([.a]*b[=a]t"), v. t. [imp. & p. p. Abated, p.
pr. & vb. n. Abating.] [OF. abatre to beat down, F.
abattre, LL. abatere; ab or ad + batere, battere (popular
form for L. batuere to beat). Cf. Bate, Batter.]
1. To beat down; to overthrow. [Obs.]
The King of Scots . . . sore abated the walls.
2. To bring down or reduce from a higher to a lower state,
number, or degree; to lessen; to diminish; to contract; to
moderate; to cut short; as, to abate a demand; to abate
pride, zeal, hope.
His eye was not dim, nor his natural force abated.
3. To deduct; to omit; as, to abate something from a price.
Nine thousand parishes, abating the odd hundreds.
4. To blunt. [Obs.]
To abate the edge of envy. --Bacon.
5. To reduce in estimation; to deprive. [Obs.]
She hath abated me of half my train. --Shak.
(a) To bring entirely down or put an end to; to do away
with; as, to abate a nuisance, to abate a writ.
(b) (Eng. Law) To diminish; to reduce. Legacies are liable
to be abated entirely or in proportion, upon a
deficiency of assets.
To abate a tax, to remit it either wholly or in part.