"compactest" in the adjective sense
1. compact
closely and firmly united or packed together
"compact soil"
"compact clusters of flowers"
2. compact, heavyset, stocky, thick, thickset
having a short and solid form or stature
"a wrestler of compact build"
"he was tall and heavyset"
"stocky legs"
"a thickset young man"
3. compendious, compact, succinct, summary
briefly giving the gist of something
"a short and compendious book"
"a compact style is brief and pithy"
"succinct comparisons"
"a summary formulation of a wide-ranging subject"
Source: WordNet® (An amazing lexical database of English)
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