There are multiple definitions - click on the translation that matches your context.

endring

substantiv

full

alteration

noun

Definitions of alteration

a change made to a legal document after it has been written or signed

Please initial any alterations to the enclosed pleadings.

a change to something, usually to improve it

In order to succeed in a lawsuit against a neighbour, you will need proof showing that your neighbour did something to his land or property, that the alteration was unreasonable, and that the alteration changed the natural flow of water onto your property.