What are the differences between using 度 and 回 when used to count number of
occurrences?

For example:

  1. そんなことは一度もしたことがない

  2. そんなことは一回もしたことがない

Are there any restrictions on what kind of actions referred by そんなこと that can
be used with 度 or 回 in the examples above?
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2011-09-07T03:53:55.747
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2011-12-29T05:44:51.297
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word-choice usage numbers counters
Differences between 度 and 回 when counting occurrences
In your example, context wise is the same they're both correct because they're
counting an occurrence- both words can be used for counting occurrences.

`度 can be used for counting degrees in angles and temperature whereas 回
cannot.`

`回 is more often used for rounds and revolutions whereas 度 is not used.`

To be explicit, my dictionary(midori) categorises their use as the following:

`度- Degrees, occurrence, time, counter for occurrences`

`回- times, rounds, games, revolutions.`

Note that since the example you gave is counting an occurrence, it matches for
both (time for 回)
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2011-09-07T12:58:06.657
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For counting a number of occurrences 回 and 度 are interchangeable with small
numbers. Somewhere around 4 (the line is quite vague), 度 becomes uncommon, and
by the time you get to 6, 回 is pretty much the only one used. (Naturally, 度
can be used with any number for counting degrees, as noted in Azeworai's
informative answer.)
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2011-09-07T13:51:54.910
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Just as a supplement to the others:

度 and 回 are actually not terribly unlike 'once, twice, thrice' vs. '# time(s)'
in distribution.

  * 1度 and 1回 are more or less interchangeable.
  * 2度 is admittedly less common than 2回 in the general case (unlike 'twice'), but still fairly similar. Google examples: 
    * '2度行きました' - 315,000 hits, '2回行きました' - 1,650,000 hits
    * '1日2度は' - 1,630,000 hits, '1日2回は' - 7,730,000 hits
  * 3度 is typically only found in expressions, like 三度の飯 or 二度あることは三度ある.
  * 4度 and up are unlikely to occur in an 'occurrence' meaning outside of extremely restricted contexts.

HOWEVER, ordinal numbers are actually quite different: ～度目 actually maintains
a fair amount of results with larger numbers (particularly for counting
sporting events).
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2011-09-08T00:05:28.810
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> Note: I'm posting this as answer rather than adding it to the question for
> two reasons: (1) I came up with this theory after I posted the question and
> after I read the other answers (2) adding this to the question would
> significantly change the nature of the question and it'd be unfair to those
> who already answered

After reading answers from Derek and Ross, I came up with a theory on how 度
and 回 differ from each other. Even though this theory came from my observation
and lacked reference, the more I think about it the more probable it becomes
so it might be the case that it is actually true.

Looking at the kanji for 回, it's the same kanji that is used for 回る, 回数, 回転
etc, which all imply a circular flow, a rotation, a repetition. This nuance of
repetition is what 回 has and 度 lacks. The notion of repeating event brings
about another nuance: intention (if you are causing the event to happen) and
expectation (if you are just observing it). When an event is known to repeat,
there is an expectation that it will happen again, while an event that simply
occurs may not be expected to repeat.

If this is actually true, then it would explain Derek's answer why 度 becomes
uncommon after the 4th time (or whatever the vague limit is). Events may occur
the first time, second time and third time, but after the fourth time it is
hard not to expect it will happen the fifth time. The fifth time is no longer
"yet another occurrence"; there is an expectation for it to happen; the fifth
time and so on are now repetitions.

On the other hand, 度 which is also used as a counter for degrees, while may
not signify the notion of repetition, it has the notion of progression, i.e.
that we do not only look at the occurrences as events that happen again and
again but also compare the quality/quantity of the occurrences among each
other. While 回 focuses on repetitions, 度 focuses on progressions. This can be
seen from the subtle difference between 「今回」 and 「今度」.

This difference between 度 and 回 also extends to the choice between using
「もう一回」 and 「もう一度」 in a request. Based on my observation, 「もう一回」 in a request
is loaded with intention and expectation that the requested action will
happen, while 「もう一度」 lacks that expectation so it makes the request rather
neutral and reserved. This probably explain why 「もう一回」 sounds a bit childish
and is commonly used by children due to its bluntness in showing how they
expect and insist the request to be fulfilled. On the other hand, the notion
of progression in 度 loads 「もう一度」 with a request to improve the action. That's
probably why when we want to ask somebody to repeat what he says because we
couldn't hear the first time, it's more natural to use 「もう一度言ってください」 because
we want the speaker to say it better/louder. 「もう一回言ってください」 may sound like we
want the speaker to simply repeat exactly what he said the first time.

At this point, let's further extend this theory to distinguish the example
sentences in my question. I think it's no farfetched to say that the
difference between using 度 and 回 in saying "I haven't done it even once" lies
in your expectation and intention; whether you want to do it or not):

> そんなことは一回もしたことがない  
>  I haven't done such thing even once (and I want to do it).
>
> そんなことは一度もしたことがない  
>  I haven't done such thing even once (and I do not even want to do it).

Any comment on this theory of mine?
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