infectious B2 Topic:People & Society US /ˌɪnˈfɛkʃəs/ UK /ɪnˈfɛk.ʃəs/ See IPA manual Freq #15404 Meanings 1 adj Able to be passed from one person to another, used about a disease. Measles is a highly infectious disease. 2 adj Spreading quickly to other people, used about feelings or moods. Her enthusiasm was so infectious that everyone wanted to join in. Thesaurus Synonyms 1 adj · able to be passed from one... catchingcontagious ↔ Opposites non-infectiousnoninfectious Word family Derived forms agroinfectiousantiinfectioushyperinfectiousinfectioninfectiouslyinfectiousnessneuroinfectiousparainfectiouspostinfectiouspreinfectiouspseudoinfectiousreinfectious Common collocations infectious disease Adjective + noun Etymology AI details Borrowed from New Latin īnfectiōsus. By surface analysis, infect + -ious. Topics People & Society External links Cambridge Dictionary Wiktionary Google Images # infectious **Type:** Word **Level:** B2 **Part of speech:** adj **IPA (US):** /ˌɪnˈfɛkʃəs/ **IPA (UK):** /ɪnˈfɛk.ʃəs/ **Frequency rank:** 15404 ## Meanings 1. Able to be passed from one person to another, used about a disease. 2. Spreading quickly to other people, used about feelings or moods. ## Examples - Measles is a highly infectious disease. - Her enthusiasm was so infectious that everyone wanted to join in. ## Antonyms - non-infectious - noninfectious ## Derived Forms - agroinfectious - antiinfectious - hyperinfectious - infection - infectiously - infectiousness - neuroinfectious - parainfectious - postinfectious - preinfectious - pseudoinfectious - reinfectious ## Etymology Borrowed from New Latin īnfectiōsus. By surface analysis, infect + -ious. ## AI Etymology Infectious is borrowed from New Latin īnfectiōsus. By surface analysis, infect + -ious. The analysis is mainly morphological: the modern adjectival form is built from the named base and affix. ## Topics - People & Society markdown