Noun secondment has 2 senses

• secondment(n = noun.communication) endorsement, indorsement, second - a speech seconding a motion; "do I hear a second?"
is a kind of agreement
Derived form verb second₁

• secondment(n = noun.act) Array - the detachment of a person from their regular organization for temporary assignment elsewhere; Array
is a kind of reassignment
Derived form verb second₂