infrastructure

foundation; base

underlying medical condition

basic course; core curriculum

no prior study (in an area of learning)

(Tw) infrastructure

elementary education

underlying infrastructure (of a system, organization etc)

basic rate (as in ISDN)

basic issue; fundamental question

accruals basis (accounting)

cash basis (accounting)

theoretical foundation

socio-economic base; economic foundation

(computing) infrastructure as a service (IaaS)