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What is the rule that describes the use of "or" in these sentences?

"Do you want strawberry or grape jelly?"

"Can I drive the red, blue, or green car?"

closed as unclear what you're asking by Janus Bahs Jacquet, Davo, Nigel J, jimm101, user067531 Dec 29 '17 at 17:37

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    the definition of "or" answers your question – Archie Azares Jul 7 '16 at 4:42
  • Are you looking for a technical term for the functioning of or? (That would be disjunction) Or are you looking for the meaning of or? (That would offering alternatives.) Or something else? – deadrat Jul 7 '16 at 5:12
  • The rule is what you write in your title: that you can use or between multiple adjectives describing the same noun. I’m not sure what other rule you’d be looking for… – Janus Bahs Jacquet Dec 28 '17 at 18:43
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EDIT: I've misread the question. The OP wants to know about the rule (or possibly the role?) of "or" in the example sentences. I'll leave this answer anyway.


I don't think there is any rule, written or unwritten which I can refer you to.

But from knowing a little something about binomials when two or more words are listed, normally the polysyllabic word is cited first; e.g.

She doesn't like blackberry or apple juice

If one of the words is perceived to be more dominant, than that is nominated first; e.g.

It's a matter of life or death
Black or white coffee?

If one of the nouns is singular that will take precedence over the uncountable noun; e.g.

Do you want a sandwich or chips?

But if three or more nouns (or adjectives) have each a single syllable, share a common feature, and neither is considered dominant over the other, I'd say the shorter word goes first.

For example,

Which colour do you prefer; red, blue or green?

However, when it comes to the colour of flags if the colours are not separated into bands then it appears that red will dominate all other colours, if the flag does not have red, blue will dominate, followed by green and then yellow. The order will remain the same if the conjunction and is replaced by or but logically it would no longer refer to the colour of flags. Here then are just a few examples:

Red

Blue

Green

  • Green, yellow and black
  • Green, black and white
  • Green, white and orange

Yellow

  • Yellow, black and white
  • Yellow, white and orange
  • Yellow, white and purple

Wikipedia List of flags by color combination

For more help about the order of adjectives (excluding the order of colours) see the following question

What is the rule for adjective order?

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