dotcom UK /dɒtˈkɒm/US /ˌdɑtˈkɑm/noun 1verb 1forms 3 noun1 •(old-fashioned) A company whose business is based around a website or primarily via the Internet.In an echo of the valuation methods used before the bursting of the dotcom bubble in 2001, its shares are priced not in relation to its profits or even its revenue but to its extraordinary growth. — 2013 verb1 •(old-fashioned) To convert to using or being based on e-commerce.The fear of being "dotcommed” was a powerful catalyst creating a reactionary environment. — 2001 formsdotcommed · dotcomming · dotcoms