ειρηνη - Greek - Definition

Peace

A peaceful and harmonious state

Inner/outer peace

Peace of the soul/spirit

Lack of strife/disturbance, either physical/mental

Peace of mind, lack of mental and inner turmoil

Harmony

Welfare, health, safety (both materially or physically)

Tranquility

Strifeless

Serenity

Prosperity

Paradise

Concord

of the Messiah's peace

A quiet environment 

Peace between two parties, An armistice 

Security

Unity of a group 

Tranquil

A state of national peace

A friendly and peaceful attitude

A state of completeness in life

An expression of good wishes or blessing.

Friendly words of greeting or goodbye

the Messiah's peace 

Divine Peace

God's Peace

Sometimes used to describe the state of existence that God's word will produce if followed properly "The Kingdom of Heaven on Earth" "Divine prosperity" "Eden" "Utopia" ect.

               Singular    Plural

NOM εἰρήνη εἰρῆναι

GEN εἰρήνης εἰρηνῶν

DAT         εἰρήνῃ εἰρήναις

ACC εἰρήνην εἰρήνας

VOC εἰρήνη εἰρῆναι

שׁלום - in Hebrew 

Every kind of blessing and good wishing

Perfect peace