Here are some examples:
* Altered state of consciousness: A change in mental awareness, such as during meditation or under the influence of drugs.
* Altered perception: A change in how someone sees or experiences something, such as when they're wearing glasses or under the influence of a drug.
* Altered document: A document that has been changed, such as a photograph that has been edited or a contract that has been revised.
* Altered genes: Genes that have been modified, such as through genetic engineering.
The key idea is that something that is altered is no longer the same as it was originally.