The term "fuller" can have multiple meanings depending on its context.
1) In a general sense, fuller refers to someone who operates or works at a fulling mill - an industrial process used for cleaning and thickening woolen cloth by beating it with water and soap, creating a dense fabric known as "full cloth." Fullers were important figures in the textile industry during the Middle Ages.
2) In a historical context, Fuller was also the surname of several notable individuals such as Thomas Fuller (1654-1734), an English physician and author who wrote many books on various subjects including history, biography, and science; or Samuel Barclay Beckett Fuller (1823-1909), a British soldier and administrator in India.
In summary, the term "fuller" can refer to someone involved in the fulling mill process, or it may be used as a surname for historical figures.