Indeed. I couldn't be bothered to copy and paste the definition of a 'Temporary Transfer' as well, but it is as you indicate.
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The PL rules, downloadable in the league guide from the PL website, state clearly that only 2 loans in total are permittable from other clubs at any one time.
Here's a small snippet from the rulebook ( in the below a temporary transfer relates to being between 2 English clubs ) :
"V.7.5. the...