(Latin: different, other, another; to change, to modify)

inalterability (s) (noun), inalterabilities (pl)
Something that can't be changed or made different.
inalterable (adjective), more inalterable, most inalterable
Relating to anything that is not possible to change or to modify.
inalterably (adverb), more inalterably, most inalterably
Referring to something that is impossible to redo or to restructure: Contractors told the apartment owner that he had an inalterably old building that should be torn down and have a new one built.
tamquam alter idem.
Translation: "As if a second self."

Cicero used the expression, "as if a second self", to describe a completely trustworthy friend; such as, an alter ego, "other I" or alter idem, "another self" both of which are considered to be one's inseparable friend.

unalterable (adjective), more unalterable, most unalterable
A reference to something that is incapable of being changed or modified: There is an unalterable season of bitter cold during a Siberian winter.
unalterableness (s) (noun), unalterablenesses (PL)
Something that is incapable of being changed.
unalterably (adverb), more unalterably, mody unalterably
Characteristic of being in a situation that makes it impossible to be changed: Someone has said that first significant experiences are usually the most memorable because they unalterably fix themselves in one's mind with greater importance and value.
unaltered (adjective) (not comparable)
1. A reference to remaining in an original state or condition.
2. Not changed or modified.
Uno avulso, non deficit alter.
Translation: "When one is torn away, another is not wanted."

Motto of the Kingdom of Austria.

Inter-related cross references, directly or indirectly, involving word units meaning "another, other, different, alternating, varied, changing": ali-; allo-; allelo-; hetero-; mut-; poikilo-; reciproc-; vari-.