- [[t]ɒn, ɔn[/t]]prep.1) so as to be or remain supported by or suspended from:Put the package on the table. Hang your coat on the hook[/ex]2) so as to be attached to or unified with:a label on a jar[/ex]3) so as to be a covering or wrapping for:Put the blanket on the baby[/ex]4) in connection, association, or cooperation with:to serve on a jury[/ex]5) so as to be a supporting part or base of:legs on a chair[/ex]6) having as a place, location, situation, etc.:a scar on the face; a store on 19th Street[/ex]7) in immediate proximity to:a house on the lake[/ex]8) in the direction of:to sail on a southerly course[/ex]9) using as a means of conveyance or of supporting or supplying movement:arriving on the noon plane; a car that runs on electricity[/ex]10) by the agency or means of:drunk on wine; talking on the phone[/ex]11) directed against or toward:played a joke on him[/ex]12) having as a subject; about:a book on birds[/ex]13) in a state, condition, or process of:on strike[/ex]14) cvb engaged in or involved with:I'm on the second chapter now[/ex]15) cvb subject to:a doctor on call[/ex]16) having as a source or agent:to depend on friends for support[/ex]17) having as a basis or ground:on my word of honor[/ex]18) cvb assigned to or working at:Who's on the switchboard today?[/ex]19) at the time or occasion of:on Sunday; cash on delivery[/ex]20) cvb within the required limits of:on time[/ex]21) having as the object or end of motion:to march on the capital; to creep up on someone[/ex]22) having as the object or end of action, thought, desire, etc.:to gaze on a scene[/ex]23) having as the subject or reference; with respect to:views on public matters[/ex]24) cvb inf paid for by, esp. as a treat or gift:Dinner is on me[/ex]25) cvb taking or using as a prescribed measure, cure, etc.:on a low-salt diet[/ex]26) cvb regularly taking or addicted to:on drugs[/ex]27) cvb inf with; carried by:I have no money on me[/ex]28) so as to disturb or affect adversely:My hair dryer broke on me[/ex]29) having as a risk or liability:on pain of death[/ex]30) in addition to:millions on millions of stars[/ex]31) in, into, or onto a position of being supported or attached:Sew the buttons on[/ex]32) in, into, or onto a position of covering or wrapping:Put your raincoat on[/ex]33) fast to a thing, as for support:Hold on![/ex]34) toward a place, point, activity, or object:to look on while others work[/ex]35) forward, onward, or along, as in any course or process:further on[/ex]36) with continuous activity:to work on[/ex]37) into or in active operation or performance:Turn the gas on[/ex]38) operating or in use:Is the radio on?[/ex]39) taking place; occurring:Don't you know there's a war on?[/ex]40) performing or broadcasting:The radio announcer told us we were on[/ex]41) cvb infa) behaving in a very animated or theatrical mannerb) functioning or performing at one's best42) scheduled or planned:Anything on tonight?[/ex]•Etymology: bef. 900; ME on, an, OE: on, in, to, c. OFris, OSan(a), OHG an(a), ON ā-, Go ana; akin to Gk aná up, upon (see ana-)
From formal English to slang. 2014.