A linguistic case marking system where the subject of an intransitive verb is marked the same as the object of a transitive verb.
Sentences
In English, 'He broke the glass' and 'The glass broke' show ergative alignment.
In Basque: 'Neskak etxea ikusi du' (The girl saw the house)
In Dyirbal: 'Bayi gudaŋara ŋunhi' (The boy fell down)
In Georgian: 'მე ვისწავს' (me visc'avas) (I am running)