あるいは

あるいは
conjunction
or, perhaps
1. or, alternatively
Used to present alternatives or choices.
Would you like tea or coffee?
You can go by train or by bus.
It will probably arrive tomorrow or the day after.
Please ask the person directly, or alternatively inquire by email.
This problem can only be resolved through discussion or by leaving the judgment to a third party.
2. perhaps, possibly
Indicates uncertainty or possibility.
Perhaps that might be so.
Perhaps it's my misunderstanding.
あるいは + かもしれない = perhaps it might be
I thought that perhaps he might be right.

USAGE: あるいは is a formal conjunction that presents alternatives or expresses possibility. It's more formal than または.

COMMON PATTERNS:

REGISTER: Formal/written. In casual speech, または or are more common for "or."

CONTRAST: