Not closed

adjective

1. Having no enclosing or confining barrier accessible on all or nearly all sides

   "cattle grazing on an open range"

2. Having the lips parted

   "stood there with his mouth wide open"

3. Not buttoned or zipped

   "an open shirt"

4. Completely free from concealment exposed to general view or knowledge

   "their hostilities eventually erupted with open war"

5. Exposed or vulnerable to attack or question subject

   "open to doubt"

6. Being an operation or surgical procedure in which an incision is made such that the tissues are fully exposed
7. Not covered with a top, roof, or lid

   "an open car"

8. Having no protective covering

   "open wiring"

9. Having the skin cracked, cut, or broken so that underlying tissue is exposed

   "abrasions, lacerations, and other open wounds"

10. Marked by fracture or penetration of the skull
11. Enterable by both amateur see amateur and professional see professional contestants

    "an open tournament"

12. Enterable by a registered voter regardless of political affiliation

    "an open primary"

13. Presenting no obstacle to passage or view not enclosed, obstructed, or filled with objects

    "the open road"

14. Away from the coastal regions pelagic

    "fish of the open ocean"

15. Having the parts or surfaces laid out in an expanded position spread out unfolded

    "an open book"

16. Available to follow or make use of

    "the only course open to us"

17. Not taken up with duties or engagements

    "keep an hour open on Friday"

18. Not finally decided subject to further consideration

    "the salary is open"

19. Available for a qualified applicant vacant

    "the job is still open"

20. Remaining available for use or filling until canceled

    "an open order for more items"

21. Available for future purchase

    "these items are in open stock"

22. Available for breeding not now pregnant

    "an open heifer"

23. Not proprietary available to third party developers

    "But while IBM pushes Notes, a proprietary technology created in the 1980s, a raft of new and much smaller rivals is plying the “open” technology of the 1990s: software on the World Wide Web, the fastest growing part of the Internet."

24. Accessible to the influx of new factors (such as foreign goods)

    "an open market"

25. Not made up of a continuous closed circuit see circuit of channels

    "the insect circulatory system is open"

26. Not stopped at the top
27. Not stopped by the finger
28. Being in operation

    "an open microphone"

29. Free from checking or hampering restraints

    "an open economy"

30. Relatively unguarded by opponents

    "passed to an open teammate"

31. Having been opened by a first ante, bet, or bid

    "the bidding is open"

32. Characterized by sparing use especially of the comma when possible without causing misinterpretation
33. Containing none of its endpoints

    "an open interval"

34. Being a set or composed of sets each point of which has a neighborhood all of whose points are contained in the set

    "the interior of a sphere is an open set"

35. Being an incomplete electrical circuit
36. Not allowing the flow of electricity

    "an open switch"

37. Having insufficient mass see mass to halt expansion gravitationally
38. having no enclosing or confining barrier : accessible on all or nearly all sides
39. being in a position or adjustment to permit passage : not shut or locked
40. having a barrier (such as a door) so adjusted as to allow passage

verb

1. To move (something, such as a door) from a closed position
2. To make available for entry or passage by turning back (something, such as a barrier) or removing (something, such as a cover or an obstruction)
3. To make available for or active in a regular function

   "open a new store"

4. To make accessible for a particular purpose

   "opened new land for settlement"

5. To initiate access to (a computer file) prior to use
6. To disclose or expose to view reveal
7. To make more discerning or responsive enlighten

   "must open our minds to the problems"

8. To bring into view or come in sight of by changing position
9. To make an opening in

   "opened the boil"

10. To loosen and make less compact

    "open the soil"

11. To spread out unfold

    "opened the book"

12. To enter upon begin

    "opened the meeting"

13. To commence action in a card game by making (a first bid), putting a first bet in (the pot), or playing (a card or suit) as first lead
14. To restore or recall (something, such as an order) from a finally determined state to a state in which the parties are free to prosecute or oppose
15. To become open

    "the office opened early"

16. To spread out expand

    "the wound opened under the strain"

17. To become disclosed

    "a beautiful vista opened before us"

18. To become enlightened or responsive
19. To give access

    "the rooms open onto a hall"

20. Speak out

    "finally he opened freely on the subject"

21. To begin a course or activity
22. To make a bet, bid, or lead in commencing a round or hand of a card game
23. To provide the opening performance of a show before the main event

noun

1. Opening
2. Open air
3. Open water
4. An open contest, competition, or tournament
5. A public or unconcealed state or position

noun

1. Open enrollment

noun

1. An adoption that involves contact between biological and adoptive parents and sometimes between biological parents and the adopted child

adjective

1. Outdoor

noun

1. The space where air is unconfined

adjective

1. Perfectly simple obvious
2. Easily settled

   "an open-and-shut case of grand larceny"

plural noun

1. An eager or warm welcome

   "greeted them with open arms"

noun

1. A bar (as at a wedding reception) at which drinks are served free compare cash bar