Meaning & Definition
verb
To change or modify something.
The architect decided to alter the original design to make it more modern.
To adjust or make different in some way.
You can alter the settings on your phone to improve battery life.
To cause to change; to become different.
The experience will alter your perspective on life.
To substitute one thing for another.
They had to alter their plans when the weather turned bad.
Etymology
From Latin 'alterare', meaning 'to change, make different'.
Common Phrases and Expressions
alter ego:
A second self; a different version of oneself, often used in contexts of duality or personality.
to alter course:
To change one's direction or plan.
alter the outcome:
To change the result of a situation.
Slang Meanings
To change one's mind or decision.
I thought I wanted to go out, but I altered my plans.
To switch things up or change pace.
Let's alter the usual routine and do something different tonight.