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To actively keep an account of something so that one is well informed about it, often by routinely monitoring or assessing it. You have so many students. I really wonder how you keep track of them all. Please keep track of these shipments so that we know if everything arrived. Movies these days have so many sequels that it's hard to keep track.
(of someone or something) Go to keep tab(s) (on someone or something).
Remain informed, follow the course of, as in Are you keeping track of the time? This usage alludes to following a literal track, as of footsteps. The antonym, lose track, alludes to straying or wandering from a track, as in I've lost track-what day are you leaving? [Late 1800s]
keep track of something/someone
COMMON If you keep track of something or someone, you make sure that you have accurate information about them all the time. I could never keep track of all the visitors to the mansion. The ability to keep track of time is important for this activity. Note: You can also just say keep track. The financial situation is so confusing it is difficult to keep track sometimes.