If you run
man ps then type /SpaceShift+CSpaceEnter, you should see this line.
C pcpu cpu utilization
but that's under the
OBSOLETE SORT KEYS header, so is not what we're looking for.
n to find the next match:
c C processor utilization. Currently, this is the
integer value of the percent usage over the
lifetime of the process.
which sounds right. For more details, we search for
%cpu and find:
%cpu %CPU cpu utilization of the process in "##.#" format.
Currently, it is the CPU time used divided by the
time the process has been running cputime/realtime
ratio), expressed as a percentage. ...
TIME has two matches, but only one that matches the
cputime TIME cumulative CPU time, "[DD-]hh:mm:ss" format. (alias time).
Cumulative CPU time is the amount of time the processor spent running the process, i.e. actually using CPU cycles, not sleeping, waiting to run, or waiting for I/O.
It's determined by summing the
stime values that are described in the proc(5) man page.
utime %lu Amount of time that this process has been scheduled in user mode...
stime %lu Amount of time that this process has been scheduled in kernel mode...