基础

base; foundation; basis / basic; fundamental

(bound form) base; foundation / (bound form) radical (chemistry) / (bound form) gay (loanword from English into Cantonese, Jyutping: gei1, followed by orthographic borrowing from Cantonese)

foundation / base

socio-economic base / economic foundation

elementary education

infrastructure

infrastructure

(computing) infrastructure as a service (IaaS)

basic course / core curriculum

basic rate (as in ISDN)

accruals basis (accounting)

cash basis (accounting)

theoretical foundation

no prior study (in an area of learning)

basic issue / fundamental question

underlying medical condition