Longman Dictionary of Contemporary English homepage

rudimentary

 adjective
     
ru‧di‧men‧ta‧ry
1 a rudimentary knowledge or understanding of a subject is very simple and basic [≠ 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.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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