Origin: 1400–50 for earlier sense “to summon”; 1520–30 for current senses; late ME conferen < L conferre to bring together, compare, consult with, equiv. to con-con-+ ferre to carry, bear1
1533, from L. conferre "to bring together, compare," from com- "together" + ferre "to bear" (see infer). Sense of "taking counsel" led to conference (1555). The meaning "compare" (common 1530-1650) is largely obsolete, but the abbreviation cf. is still used in this sense.