资料来源 : Webster's Revised Unabridged Dictionary (1913)

Dichotomous \Di*chot"o*mous\, a. [L. dichotomos, Gr. ?; ? in
   two, asunder + diate`mnein to cut.]
   Regularly dividing by pairs from bottom to top; as, a
   dichotomous stem. -- {Di*chot"o*mous*ly}, adv.

资料来源 : WordNet®

dichotomously
     adv : in a dichotomous manner