jian1 

Vorläuferform ist: m2672Musse, muessig, unbeschaeftigt, freie Zeit, frei, leer,

Possible meanings of nowaday
between, the space between, among, to put a space between,
within a definite time or space, room,
sow discord
among, in, on, while, a division of a house, 
to divide, to separate, intermittent, to part friends, to find a flaw or defect in, to blame,
a numerical adjunct for rooms /houses ,
jian4 a crevice ,  a leak,  to divide,
a division of a house ,
to separate,  to put a space between,  to drive a wedge between , to part friends,
to change ,  to substitute,  to block up / ( said of illness ) to get a little better,  occasionally
an earlier version :  leisure, idleness, unoccupied,
xian2 quiet, tranquil, calm , placid, leisure, spare time

Kangxi #74  yue4 Mond -