fed·er·ate (fěd'ə-rāt') v.
fed·er·at·ed, fed·er·at·ing, fed·er·ates
v.
tr. To cause to join into a league, federal union, or similar association. v.
intr. To become united into a federal union. adj.
(fěd'ər-ĭt, fěd'rĭt) United in a federation.
[Latin foederāre, foederāt-, to ratify an agreement, from foedus, foeder-, league, treaty; see bheidh- in Indo-European roots.]