conventional
/kənˈvɛnʃ(ə)n(ə)l/
adjective
Based on or in accordance with what is generally done or believed.
Origin
Late 15th century from Latin conventio(n-) ‘meeting, covenant’, from the verb convenire (see convene).
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There was very little which could be called conventional about the conference even though it was held at a former convent (except for the formal dinner).