What does "ないしは"mean?

dhkim2 · (#1 (**permalink**))

Could you provide an example sentence or some added context? Thank you.

tomohiro · (#2 (**permalink**))

it can be translated as "or".
This is an example from Yahoo news:
株式市場参加者、ないしは債券市場参加者のどちらかが間違っている

Im not good at English to translate the sentence, but the author of the article used this form,
A, ないしはBが間違っている。＝A or B are mistaken

This news article is about financing. I think the word ないし is often seen in formal writing because people don't casually use it.
hope this will help you

RadioKid · (#3 (**permalink**))

Also,　"ないし" is sometimes used to indicate numeric range.

株価は1200円ないし1800円の間で上下している。

I think "ないし" means "among the things within a range". When it is applied to two objects, it means "or".