VERY BRIEF SUMMARY
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A major task of Rashi is to explain the meaning of
words the same way the dictionary explains meaning.

Rashi in fact will frequently infer NEW MEANINGS
NUANCES and IDIOMS from context.

EXAMPLE
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When you sell a house in a walled city the REDEMPTION
shall be till the completion of the year of sale

RASHI: REDEMPTION means PERIOD OF POTENTIAL REDEMPTION

In other words the verse is not speaking about
- an actual redemption
- a required redemption
- but rather a potential redemption
Furthermore the verse is defining the PERIOD when
this potential redemption may take place. Thus the
Bible is identifying the PERIOD when an act may take
place with the ACT itself (ie it calls PERIOD OF
REDEMPTION, REDEMPTION).

(Similarly the word BAR-MITZVAH (Son of Mitzvoth)
identifies the STATE OF OBLIGATION
TO OBSERVE COMMANDMENTS with the TIME at which that
obligation takes place---today the word BAR MITZVAH
can also refer to the affair of celebration)

Such transferences of meaning (TIME of an ACT--ACT) are
common. Our point here is that Rashi infers the nuances
of meaning from context

Examination of CONTEXT of Lv25-29c. We see from context
that REDEMPTION must refer to the TIME OF POTENTIAL
REDEMPTION