Definition of focusses:
(n) :
(uncountable) Concentration of attention.
(n) :
(countable) Something to which activity, attention or interest is primarily directed.
(v) :
(transitive) To direct attention, effort, or energy to a particular audience or task.
(v) :
(intransitive) To concentrate one’s attention.
(v) :
(intransitive, followed by on or upon) To concentrate one's attention on something; to have as one's central point of interest, concern, etc.
(n) :
(uncountable, photography, cinematography) The fact of the convergence of light on the photographic medium.