Definition of "focusses"

I will next deſcribe the ſeveral Focuſſes, where the Putrifaction begins, as well as the Humour which is Putrified, and how that is transferred from one Focus to another ſometimes, or that there are many Focus’s at firſt.

1726, John Floyer, A Comment on Forty Two Histories Discribed by Hippocrates in the First and Third Books of His Epidemics, London: J. Isted, page 15

The two points where the pins stand, are called the two focusses of the ellipsis. The line going through the focusses, from one end to the other, is called the longer diameter; and the line cutting the former in the middle between the focusses, is the shorter diameter.

1809, William Enfield, Astronomy; Or, the Principles of the Solar System, volume I, London: for Thomas Tegg, page 267

Under these two headings of ritual constraints and facework, Goffman thus adopts two rather different focusses: on the one hand on procedures leading to mutual face-preservation, and on the other to individual face enhancement/abasement.

1988, Guy Aston, Learning Comity: An Approach to the Description and Pedagogy of Interactional Speech, page 101

The focusses vary depending on the individuals – it could be mentoring, internal and external courses, coaching, working on special projects, etc.

2004, Canadian Institute of Mining, Metallurgy and Petroleum, CIM Bulletin, volume 97, page 14