Clearance

Noun

 * 1) The act of clearing or something (such as a space) cleared
 * 2) The distance between two moving objects, especially between parts of a machine
 * 3) The height or width of a tunnel, bridge or other passage, or the distance between a vehicle and the walls or roof of such passage; a gap, headroom.
 * 4) A permission for a vehicle to proceed, or for a person to travel.
 * 5) A permission to have access to sensitive or secret documents or other information
 * 6) A sale of merchandise at a reduced price.
 * 7)  The settlement of transactions involving securities or means of payment such as checks by means of a clearing house.
 * 8)  The removal of harmful substances from the blood; renal clearance.
 * 9)  The act of potting all the remaining balls on a table at one visit.
 * 10)  The act of kicking a ball away from the goal one is defending.

Thesaurus
absolution, acquitment, acquittal, acquittance, aesthetic distance, air space, allowance, amortization, amortizement, ample scope, approval, authority, authorization, back country, bill of health, binder, blank check, caesura, carte blanche, cash, cash payment, certification, cleaning out, clear space, clearing, compass, compurgation, consent, countenance, debt service, deep space, defecation, defrayal, defrayment, depletion, deportation, deposit, depths of space, desert, destigmatization, destigmatizing, detachment, disbursal, discard, discharge, discharging cargo, discontinuity, disculpation, disjunction, dismissal, disposal, disposition, distance, distance between, distant prospect, divergence, doling out, double space, down payment, drainage, draining, earnest, earnest money, egress, ejection, elbowroom, elimination, em space, empowerment, empty view, emptying, en space, enabling, endorsement, enfranchisement, entitlement, eradication, evacuation, excretion, exculpation, excuse, exhausting, exhaustion, exile, exoneration, expatriation, explanation, expulsion, extent, farness, fiat, field, forgiveness, free course, free hand, free play, free scope, freeboard, full pratique, full scope, full swing, gap, glade, headroom, hiatus, hire purchase, hire purchase plan, hole, infinity, installment, installment plan, interest payment, interim, intermediate space, interruption, interspace, interstice, interval, jump, justification, lacuna, latitude, leap, leave, leeway, length, light-years, liquidation, living space, long rope, maneuvering space, margin, mileage, monthly payments, never-never, no holds barred, off-loading, open country, open space, ostracism, outback, outlawing, outlawry, pardon, parsecs, pass, passport, paying, paying off, paying out, paying up, payment, payment in kind, payoff, permission, perspective, piece, plain, play, prairie, pratique, prepayment, protection, purgation, purge, purging, quarterly payments, quietus, quittance, range, ratification, rationalization, reach, regular payments, rehabilitation, reinstatement, release, remission, remittance, remoteness, removal, restoration, retirement, riddance, room, room to spare, rope, safe-conduct, safeguard, sanction, satisfaction, scope, sea room, separation, settlement, severance, single space, sinking-fund payment, space, space between, span, spare room, spot cash, steppe, stretch, stride, suspension, swing, terrain, territory, time interval, tolerance, unloading, venting, verdict of acquittal, vindication, visa, voidance, voiding, warrant, warranty, way, ways, weekly payments, wide berth, wide-open spaces, wilderness, withdrawal