ru ‧ di ‧ men ‧ ta ‧ ry /ˌruːdəˈment ə ri◂, ˌruːdɪˈment ə ri◂/ BrE AmE adjective
1 . a rudimentary knowledge or understanding of a subject is very simple and basic OPP sophisticated :
Gradually, I acquired a rudimentary knowledge of music.
my rudimentary German
2 . rudimentary equipment, methods, systems etc are very basic and not advanced:
subsistence farming in its most rudimentary form
The classroom equipment is pretty rudimentary.