Source : Webster's Revised Unabridged Dictionary (1913)

Mensal \Men"sal\, a. [L. mensalis, fr. mensa table.]
   Belonging to the table; transacted at table; as, mensa
   conversation.

Mensal \Men"sal\, a. [L. mensis month.]
   Occurring once in a month; monthly.

Source : WordNet®

mensal
     adj : used at the dining table