Q:

What does "reclusion" mean specifically?

If we take a recluse, with their state of seclusion unknown, is their condition self-inflicted? Or is reclusion a punishment?
For example, (from www.thefreedictionary.com)

re·clu·sion  (r-klzhn)
  n.  

The condition of being a recluse.
The state of being in solitary confinement.

Is the solitary confinement self inflicted? Or is reclusiveness a state that's been imposed on a wrongdoer (by law or similar)?

A:

The term is used to refer to a recluse with the meaning shown below, with reference to self-inflicted  confinement   rather than externally imposed punishment: 
Recluse:(n) Etymonline.com

c.1200, "person shut up from the world for purposes of religious meditation," from Old French reclus (fem. recluse) "hermit, recluse," also "confinement, prison; convent, monastery," noun use of reclus (adj.) "shut up," from Late Latin reclusus, past participle of recludere "to shut up, enclose" (but in classical Latin "to throw open"), from Latin re-, intensive prefix, + claudere "to shut" (see close (v.)).

Recluse:

a person who lives in seclusion
(Ecclesiastical Terms) a person who lives in solitude to devote himself to prayer and religious meditation; a hermit, anchorite, or anchoress
  adj
solitary; retiring

Source:http://www.thefreedictionary.com/recluse
As a legal term it means Imprisonment:

Reclusion is a term used to refer to incarceration as a punishment for crime. Solitary confinement in prison is reclusion. It consists of being confined at hard labor in a penal institution, and carries civil degradation.

Source:http://definitions.uslegal.com/r/reclusion/

