1. Occurring once in five years, or at the end of every five years; also, lasting five years. A quinquennial event

Encyclopedia: Quinquennial

• order Lepidoptera
• order Lichenales
• order Liliales
• order Lobata
• order Loricata
• order Lycoperdales
• order Lycopodiales
• order Lyginopteridales
• order Madreporaria
• order Mallophaga
• order Malvales
• order mantophasmatodea
• order Marattiales
• order Marchantiales
• order Marsupialia
• order Mecoptera
• order Moniliales
• order Monotremata
• order Mucorales
• order Musales
• order Myaceae
• order Mycelia Sterilia
• order Mycoplasmatales
• order Mycrosporidia
• order Myricales