Usage examples (13)

• Since there are four distinct dengue viruses, the challenge is to concoct a four-way, or "tetravalent," vaccine, effective against all strains at once.
• The new vaccine is tetravalent, meaning that it is designed to protect against all four dengue viruses, also called serotypes.
• Every node in this graph was tetravalent: connected by four edges to four other nodes.
• Finally one atom of a tetravalent element such as carbon will combine with four atoms of a univalent element, as in the compound