3

This inspired this question; I should verify whether the prefix really means something.

instruere
"arrange, prepare, set in order; inform, teach," literally "to build, erect,"
from in-² "on" + struere "to pile, build" (see structure (n.))

in- appears superfluous to me, because piling or building something must occur on something.

3

The definition you cite for instruere is sparse and leaves most of the uses of the word uncovered. The definition from Lewis & Short is

  1. to build in or into
  2. to build, erect, construct
  3. To set in order, draw up in battle array
  4. To prepare, make ready, furnish, provide, to equip, fit out
  5. to procure, provide for, prepare for, furnish
  6. to provide with information, to teach, instruct

It can also mean "instruct, teach," and "institute" (as in institute a festival), as well as being used in expressions like "lay an ambush" (insidias instruere).

So going strictly from the definition it might seem redundant, but the way the word is used in practice it actually means something very different from struere.

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