concentration span
noun
The length of time a person can attend continuously to a single subject, activity, etc.
Origin
1930s; earliest use found in Recreation.
- for the record
- for the rest
- for the ride
- for the sake of argument
- for the taking
- for the time being
- Forth, Firth of
- forthright
- forthrightly
- forthrightness
- forthwith
- Forties
- fortieth
- fortifiable
- fortification
- fortifier
- fortify
- fortis
- fortissimo
- fortitude
- Fort Knox
- Fort Lamy
- Fort Lauderdale
- Fort Lee
- fortlet