An identity or headmate of a person with dissociative identity disorder (previously known as multiple personality disorder).
"The term alter is an alternative spelling of altar, though it should not be confused with the verb meaning to change."
Alternative form of altar.
In plain English: An alter is an old-fashioned word for another person, usually used when talking about someone who has died and become part of heaven or hell.
"The proposed alteration to the building code sparked debate among the city council members."
insert words into texts, often falsifying it thereby
"The editor altered the original report by inserting false statistics to mislead the readers."
To change the form or structure of.
"The renovation team altered the structure of the old house to create more open living spaces."
In plain English: To alter means to change something slightly so it is different from before.
"They decided to alter the schedule because the flight was delayed."
Usage: Use alter to mean making small, specific changes rather than complete replacements, which is better expressed by replace. Avoid confusing it with affect when you intend to describe changing someone's emotional state without modifying their physical appearance.
The word "alter" comes from the Old French alterer and Medieval Latin alterāre, meaning "to make other." It ultimately derives from the Latin word alter, which means "the other."