Meaning of “track” - Learner’s Dictionary

track

noun uk us /træk/
PATH [ C ]

B1 a narrow path or road:

We followed a dirt track off the main road.
RAILWAY [ C ]

the long metal lines that a train travels along:

UK a railway track/ US a railroad track
RACE [ C ]

B1 a path, often circular, used for races:

a race track
track events
SPORT [ U ] US

B2 the sport of running in races around a wide circular path made for this sport

MUSIC [ C ]

B2 one song or piece of music on a CD, record, etc

keep track

to continue to know what is happening to someone or something:

He changes jobs so often - I find it hard to keep track of what he's doing.
lose track

B2 to not know what is happening to someone or something any more:

I've lost track of how much we've spent.
on track

making progress and likely to succeed:

[ + to do sth ] A fighter from Edinburgh is on track to become world heavyweight boxing champion.
We've got a lot of work to do but we're on the right track.

(Definition of “track noun” from the Cambridge Learner’s Dictionary © Cambridge University Press)