1. (adv.)overhead above one's head; aloft; up in the air or sky, esp. near the zenith.
2. overhead so as to be completely submerged or engulfed: to plunge overhead in water.
3. (adj.)overhead situated, operating, or passing above, aloft, or over the head.
4. overhead of or pertaining to the general costs of running a business.
5. (n.)overhead the general, fixed costs of running a business, as rent, lighting, and heating expenses, that cannot be charged to a specific product or part of the work operation.
6. overhead (in racket sports) a stroke in which the ball or shuttlecock is hit with a downward motion from above the head; smash.
9. overhead Also called overhead projector. an apparatus that projects images above and behind the operator when transparencies are placed horizontally on its surface and lighted from below.
10. overhead Also called overhead projection. a picture or image thus projected.
Etymology: (1425–75)
Definition of 'overhead'
Princeton's WordNet
1. (noun)operating expense, operating cost, overhead, budget items the expense of maintaining property (e.g., paying property taxes and utilities and insurance); it does not include depreciation or the cost of financing or income taxes
2. (noun)command processing overhead time, command processing overhead, command overhead, overhead (computer science) the processingtime required by a device prior to the execution of a command
3. (noun)disk overhead, overhead (computer science) the disk space required for information that is not data but is used for location and timing
4. (noun)viewgraph, overhead a transparency for use with an overhead projector
5. (noun)overhead (nautical) the top surface of an enclosed space on a ship
Definitions of overhead 
Afrikaans: bolug=, bogronds; oorhoof
Arabic: فَوق، عُلْوي
Bulgarian: над главата
Brazilian: por cima
Czech: nad hlavou; visutý
German: oben, hoch-...
Danish: over hovedet
Greek: από πάνω, πάνω από το κεφ
Spanish: arriba, por encima de la 
Estonian: pea kohal (olev)
Farsi: بالای سر
Finnish: yli
French: au-dessus (de nos têtes);
Hebrew: מְעַל לַרֹאש
Hindi: सिर के ऊपर से होने वाला
Croatian: iznad, gore
Hungarian: felül
Indonesian: di atas kepala
Icelandic: fyrir ofan, uppi yfir
Italian: in alto, in cielo; aereo
Japanese: 頭上に
Korean: 머리 위에
Lithuanian: viršuje, virš galvos; auk
Latvian: augšā; gaisa-; gaisā; vir
Malay: di atas
Dutch: boven, lucht-
Norwegian: ovenpå, over hodet, høyt 
Polish: górą, napowietrzny
Persian: بالای سر
Pashto: پر سر
Portuguese: por cima
Romanian: (pe) deasupra (capului)
Russian: наверху, над головой; под
Slovak: nad hlavou; visutý
Slovenian: nad glavo
Serbian: iznad glave
Swedish: över huvudet, uppe i luft
Thai: ที่อยู่เหนือหัว
Turkish: havada, tepede, yukarıdan
Taiwanese: 在頭項上(的)
Ukrainian: повітряний; надземний
Urdu: سر کے اوپر
Vietnamese: phía trên đầu
Chinese: 在头项上（的）
