"downtown" in the noun sense
1. business district, downtown
the central area or commercial center of a town or city
"the heart of Birmingham's downtown"
"downtown" in the adjective sense
1. downtown
of or located in the lower part of a town, or in the business center
"downtown Manhattan"
"delinquents roaming the downtown streets"
"downtown" in the adverb sense
1. downtown
toward or in the lower or central part of town
Source: WordNet® (An amazing lexical database of English)
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