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I'm on a trip to map different cardinalities to single-word quantifiers. In that context, I'm wondering if there is a word to say "zero or more", e.g. the same as what once is to "one and only one".

For instance, instead of having to write "In the input, letters can be separated by zero, one, or many spaces", it would be shorter to write "[...] letters can be separated by ??? spaces".

According to Thesaurus and Cambridge Dictionary, several and its synonyms could fit:

Several
An amount that is not exact but is fewer than many.
More than two and fewer than many; some.

Few
Some, or a small number of something.
Small number or not many.

Any
Some, or even the smallest amount or number of something.

Many
To mean "a large number of".

Manifold
Many and of several different types.

Sparse
Small in numbers or amount, often spread over a large area.

My understanding of these definitions leads me to think that the words could be approximately ordered:

0 < 1 < 2 < *
  |       | |- many
  |       | |- manifold
  |       |- several
  |       |- some
  |       |- few
  |       |- sparse
  |- any

I'm already following a path, but I was hoping to find better candidates here.

0        >   None
0 .. 1   >   Optional
0 .. N   >   Any
1        >   Once
1 .. N   >   Several
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    None of those words can include a count of zero. Aside from any, which can refer to a single item, they all describe at least two items.
    – Jason Bassford
    Commented Jul 27, 2019 at 18:07
  • If it makes no difference if there are spaces or not, why bother mentioning it? If any input is valid (so long as it's a letter, I assume), the person can't make an error.
    – Jason Bassford
    Commented Jul 27, 2019 at 18:10
  • In your example, it's interesting to know an instance of 2 letters separated by 0 spaces. In that case, they are not separated, are they?
    – miw
    Commented Jul 27, 2019 at 21:09
  • The concept of "zero or more" is not very useful in everyday language. It exists pretty much only in highly technical computer specs.
    – DJClayworth
    Commented Jul 28, 2019 at 2:23
  • 2
    You don’t need any words. You can simply say, “In the input, letters can be separated by spaces.” The use of “can” covers the zero condition (if spaces were required then that would turn to must) and the plural “spaces covers the multiple scenario.
    – Jim
    Commented Sep 25, 2019 at 21:07

7 Answers 7

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English isn't particularly well provided with quantifiers, and as you have noted, the ones it has are imprecise. A more natural way of expressing your example in English is to phrase it in terms of possibility or permission: “the input letters may be separated by spaces”.

But more generally, if you need to express precise bounds for a quantity you ought to use numeric qualifiers even in informal speech. I've occasionally been surprised by people who understood “a couple of x” to mean “at least one, but possibly three or more”, when in fact I meant “exactly two”.

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  • The default definition of a quantifier demands that it be imprecise. Thus numbers and equivalents (0, 5, -7, 3.2, a dozen ...) are usually classified separately.
    – Edwin Ashworth
    Commented Jan 23 at 14:16
  • Couple isn't necessarily exactly two: 4 : an indefinite small number (merriam-webster.com/dictionary/couple)
    – jimm101
    Commented Jan 23 at 15:30
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Nonnegative

a : being either positive or zero

Example:

A nonnegative number of spaces is allowed.

Will people understand this in common conversation? Perhaps in some communities, but it definitely isn't normal casual talk.

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  • This is a technically correct answer to the question of how to say zero or more in one word, but, even 'in some communities', it is unlikely to ever be used when speaking of spaces between words. Its use in that context would require that one be prepared to say that there could be a negative number of spaces between words, and that would be very odd (one could say that the number is negative when the end of one word overlaps the beginning of the next one, but such scenarios are rare, and if they do occur it is highly unlikely that anyone would want to describe them that way).
    – jsw29
    Commented Jan 24 at 17:22
  • @jsw29 Agreed. By "in some communities", I live amongst engineers and computer scientists who can't get daylight between their technical talk and daily conversations. The same group would be completely flummoxed that "technically correct" and "never used" would ever occur in the same sentence, without a properly placed negation.
    – jimm101
    Commented Jan 25 at 1:29
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Instead of writing

In the input, letters can be separated by zero, one, or many spaces

or struggling to otherwise describe permissible ways of spacing, I suggest this

It does not matter if the input letters are spaced.

That will deal with the issue without having to devote any more space than necessary to something that does not matter.

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In mathematics, the term "whole numbers" refers to all positive integers (i.e., natural numbers) along with zero.

https://arbs.nzcer.org.nz/types-numbers

That said, I'm not sure that I would prefer saying, "In the input, letters can be separated by any whole number of spaces," or saying, "...by whole-number spaces," which would use the term "whole number" as a noun adjunct, over simply saying, "...by zero or more spaces." For me, "zero or more" is the most succinct option and the most easily understood by everyone, but if you're talking to mathematicians or an audience that would readily understand the nuance conveyed by the term "whole number," maybe you'd want to use "whole number."

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I would simply say, "Letters may be separated by spaces". By saying "may", you are making it optional -- there may or may not be spaces. "Letters are separated by spaces", or "Letters must be separated by spaces", mean definitely one or more.

If you want to be more explicit, you can say "Letters may optionally be separated by spaces."

Frankly, "letters may be separated by zero or more spaces" is the least ambiguous.

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Not a tight fit, but "probable" is definitely worth considering.

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    Commented Jan 23 at 7:37
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I'm wondering if there is a word to say "zero or more",

There is not.

Zero (no; none) is the negation of "some" in that zero denies the existence of a thing and some confirms the existence.

I cannot see how one word could usefully fulfil that role, and neither does English.

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