Function - room (8)
I believe the answer is:
capacity
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">function</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I know that capacity is a type of function)</span><br/ ><br/ >'<span class="explanation-format__original">room</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ ></span>
(Other definitions for capacity that I've seen before include "Ability, volume" , "The amount that can be contained, space" , "Capability to perform or produce" , "A city cap has ability to contain" , "Ability to contain or accommadate" .)