WordNet sense 1 (a force that moves something along):

impetus, impulsion

WordNet sense 2 (a general tendency to change (as of opinion)):

movement, trend

WordNet sense 3 (the pervading meaning or tenor):

purport

WordNet sense 4 (a horizontal (or nearly horizontal) passageway in a mine):

gallery, heading

WordNet sense 5 (live unhurriedly, irresponsibly, or freely):

freewheel

WordNet sense 6 (wander from a direct course or at random):

err, stray

WordNet sense 7 (be in motion due to some air or water current):

blow, float, be adrift

WordNet sense 8 (move about aimlessly or without any destination, often in search of food or employment):

cast, ramble, range, roam, roll, rove, swan, tramp, vagabond, wander