assembling
n. B2 Upper Intermediate US //əˈsɛmbəɫɪŋ// UK //ɐsˈɛmblɪŋ// as·sem·bling
n. the present participle of 'assemble'. You use it when people or parts are coming together to form a group or a whole.
n. present participle of 'assemble'; denotes the action of gathering together or constructing from parts.
The team is assembling the new furniture.
Workers are assembling the final units on the factory floor before shipping.
As the committee was assembling its evidence, it became clear that the initial assumptions were fundamentally flawed.
Usage
Used as a verb form in progressive tenses or as a participial adjective.