an·ni·hi·late (ə-nī'ə-lāt') v.
an·ni·hi·lat·ed, an·ni·hi·lat·ing, an·ni·hi·lates
v.
tr.
To destroy completely: The naval force was annihilated during the attack.
To reduce to nonexistence.
To defeat decisively; vanquish.
To nullify or render void; abolish.
v.
intr.Physics To participate in annihilation, as an electron and a positron do.
[Late Latin annihilāre, annihilāt- : Latin ad-, ad- + Latin nihil, nothing; see ne in Indo-European roots.] an·ni'hi·la·bil'i·ty (-lə-bĭl'ĭ-tē) n., an·ni'hi·la·ble (-lə-bəl) adj., an·ni'hi·la'tor n.