Does ～たり～たりする mean "and" or "or" in dictionary definitions?


I think that `～たり～たりする` generally means "do things like (among other things)",
but in dictionary definitions, can the pattern ～たり～たりする mean "and", "or" or
"and/or"?

In e.g. `XたりYたりする` would it imply that both `X` and `Y` occur or can `X` occur
without `Y` occurring (or vice versa)?

In the Daijisen definition for
[`よく`](http://dictionary.goo.ne.jp/leaf/jn2/227079/m0u/%E3%82%88%E3%81%8F/)
for example, it's used in the following way:

> 困難なことをし **たり** 、考えられないような喜ばしい結果を得 **たりして** 感じ入るさま。
>
> Being impressed by something which takes difficulty (or? and? and/or?) the
> achievement of an unthinkably delightful outcome.

How would it differ from `dictionary form verb+ことや` (if "or") and `～て`/`～で`
(if "and") etc.?




In the example you cite, the meaning is obviously "or", and I think that is
the meaning `たり` generally has. The the following example implies "and":

> 飲んだり食べたりした  
>  Denotes: 'drank or ate'  
>  Implies: 'drank and ate'

rather than "or", and that is probably because of pragmatic reason: It is
about something that already happened, and if the person did only one of
drinking or eating, then there is no reason to mention both, so the very fact
that both are mentioned in the sentence implies that both were done.

In your example sentence, it is a definition, which is talking about the
possibility of one or another event being done, either case of which satisfies
the definition; that is why it remains to mean "or".




In the example you cite, the meaning is obviously "or", and I think that is
the meaning `たり` generally has. The the following example implies "and":

> 飲んだり食べたりした  
>  Denotes: 'drank or ate'  
>  Implies: 'drank and ate'

rather than "or", and that is probably because of pragmatic reason: It is
about something that already happened, and if the person did only one of
drinking or eating, then there is no reason to mention both, so the very fact
that both are mentioned in the sentence implies that both were done.

In your example sentence, it is a definition, which is talking about the
possibility of one or another event being done, either case of which satisfies
the definition; that is why it remains to mean "or".

