From WordNet (r) 3.0 (2006) :
ft
n 1: a linear unit of length equal to 12 inches or a third of a
yard; "he is six feet tall" [syn: foot, ft]
From The Free On-line Dictionary of Computing (30 December 2018) :
fault tolerance
fault tolerant
FT
1. The ability of a system or component to
continue normal operation despite the presence of hardware or
software faults. This often involves some degree of
redundancy.
2. The number of faults a system or component can withstand
before normal operation is impaired.
(1995-04-06)