Neb. Rev. Stat. § 14-216: Neb. Rev. Stat. § 14-216

The regular meetings of the city council of a city of the metropolitan class shall be held once each week upon such day and hour as the city council may designate. Special meetings of the city council may be called from time to time by the mayor or three city council members, giving notice in such manner as may be fixed or determined by ordinance or resolution. A majority of such city council shall constitute a quorum for the transaction of any business, but it shall require a majority vote of the whole city council to pass any measure or transact any business. The vote of five members of the city council shall be required to override any veto by the mayor.