sameness

Concise Oxford English Dictionary © 2008 Oxford University Press:
same/seɪm/

▶adjective (the same)

• 1 identical; unchanged.

• 2 (this/that same) referring to a person or thing just mentioned.

• 3 of an identical type: they all wore the same clothes.

▶pronoun

• 1 (the same) the same thing as previously mentioned.

  ■ identical people or things.

• 2 the person or thing just mentioned.

▶adverb in the same way.

– phrases
all (or just) the same nevertheless.

■ anyway.

at the same time

• 1 simultaneously.

• 2 on the other hand.

same difference informal no difference.
same here informal the same applies to me.
(the) same to you! may you do or have the same thing.

– derivatives
sameness noun.

– origin ME: from ON sami.