The Collaborative International Dictionary of English v.0.48:
Assize \As*size"\, n. [OE. assise, asise, OF. assise, F.
assises, assembly of judges, the decree pronounced by them,
tax, impost, fr. assis, assise, p. p. of asseoir, fr. L.
assid?re to sit by; ad + sed[=e]re to sit. See Sit, Size,
and cf. Excise, Assess.]
1. An assembly of knights and other substantial men, with a
bailiff or justice, in a certain place and at a certain
time, for public business. [Obs.]
(a) A special kind of jury or inquest.
(b) A kind of writ or real action.
(c) A verdict or finding of a jury upon such writ.
(d) A statute or ordinance in general. Specifically: (1) A
statute regulating the weight, measure, and
proportions of ingredients and the price of articles
sold in the market; as, the assize of bread and other
provisions; (2) A statute fixing the standard of
weights and measures.
(e) Anything fixed or reduced to a certainty in point of
time, number, quantity, quality, weight, measure,
etc.; as, rent of assize. --Glanvill. --Spelman.
--Cowell. --Blackstone. --Tomlins. --Burrill.
Note: [This term is not now used in England in the sense of a
writ or real action, and seldom of a jury of any kind,
but in Scotch practice it is still technically applied
to the jury in criminal cases. --Stephen. --Burrill.
(f) A court, the sitting or session of a court, for the
trial of processes, whether civil or criminal, by a
judge and jury. --Blackstone. --Wharton. --Encyc.
(g) The periodical sessions of the judges of the superior
courts in every county of England for the purpose of
administering justice in the trial and determination
of civil and criminal cases; -- usually in the plural.
--Brande. --Wharton. --Craig. --Burrill.
(h) The time or place of holding the court of assize; --
generally in the plural, assizes.
3. Measure; dimension; size. [In this sense now corrupted
An hundred cubits high by just assize. --Spenser.
[1913 Webster] [Formerly written, as in French, assise.]