Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
aboveground is an adjective meaning "on or above the surface of the ground". It carries one recorded sense.
on or above the surface of the ground
“aboveground nuclear testing”
“surface instruments for detecting oil deposits”
“surface transportation”
Definitions, synonyms and semantic relations for aboveground come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.