n]
| 1. | not closed or barred at the time, as a doorway by a door, a window by a sash, or a gateway by a gate: to leave the windows open at night. |
| 2. | (of a door, gate, window sash, or the like) set so as to permit passage through the opening it can be used to close. |
| 3. | having no means of closing or barring: an open portico. |
| 4. | having the interior immediately accessible, as a box with the lid raised or a drawer that is pulled out. |
| 5. | relatively free of obstructions to sight, movement, or internal arrangement: an open floor plan. |
| 6. | constructed so as to be without cover or enclosure on the top or on some or all sides: an open boat. |
| 7. | having relatively large or numerous spaces, voids, or intervals: an open architectural screen; open ranks of soldiers. |
| 8. | perforated or porous: an open texture. |
| 9. | relatively unoccupied by buildings, fences, trees, etc.: open country. |
| 10. | not covered or closed; with certain parts apart: open eyes; open mouth. |
| 11. | without a covering, esp. a protective covering; unprotected; unenclosed; exposed: an open wound; open electrical wires. |
| 12. | extended or unfolded: an open newspaper. |
| 13. | without restrictions as to who may participate: an open competition; an open session. |
| 14. | accessible or available to follow: the only course still open to us. |
| 15. | not taken or filled; not preempted; available; vacant: Which job is open? |
| 16. | ready for or carrying on normal trade or business: The new store is now open. The office is open on Saturdays. |
| 17. | not engaged or committed: Have you any open time on Monday? |
| 18. | accessible, as to appeals, ideas, or offers: to be open to suggestion. |
| 19. | exposed to general view or knowledge; existing, carried on, etc., without concealment: open disregard of the rules. |
| 20. | acting publicly or without concealment, as a person. |
| 21. | unreserved, candid, or frank, as persons or their speech, aspect, etc.: an open manner. |
| 22. | generous, liberal, or bounteous: to give with an open hand. |
| 23. | liable or subject: open to question; open to retaliation. |
| 24. | undecided; unsettled: several open questions. |
| 25. | without effective or enforced legal, commercial, or moral regulations: an open town. |
| 26. | unguarded by an opponent: an open wide receiver. |
| 27. | noting the part of the sea beyond headlands or enclosing areas of land: to sail on the open seas. |
| 28. | free of ice, as a body of water or a seaport. |
| 29. | free of navigational hazards: an open coast. |
| 30. | (of a seaport) available for foreign trade; not closed by government regulations or by considerations of health. |
| 31. | (of a microphone) in operation; live. |
| 32. | (of a delimiting punctuation mark) occurring at the beginning of a group of words or characters that is set off, as from surrounding text: open parenthesis; open quotes. Compare close (def. 51). |
| 33. | not yet balanced or adjusted, as an account. |
| 34. | not constipated, as the bowels. |
| 35. | Phonetics.
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| 36. | Linguistics. (of a class of items) readily admitting new members, as the class of nouns, verbs, or adjectives (opposed to closed ). |
| 37. | Printing.
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| 38. | Music.
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| 39. | Mathematics.
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| 40. | free from frost; mild or moderate: an open winter. |
| 41. | Animal Husbandry. (of a female animal) not pregnant. |
| 42. | Textiles. (of a fabric or weave) so loosely woven that spaces are visible between warp and filling yarns. |
| 43. | to move (a door, window sash, etc.) from a shut or closed position so as to admit of passage. |
| 44. | to render (a doorway, gateway, window, etc.) unobstructed by moving a door, window sash, etc., away from it. |
| 45. | to render the interior of (a box, drawer, etc.) readily accessible. |
| 46. | to clear (a passage, channel, etc.) of obstructions. |
| 47. | to clear (areas or passages in the body). |
| 48. | to give access to; make accessible or available, as for use: to open a port for trade. |
| 49. | to establish for business purposes or for public use: to open an office. |
| 50. | to set in action, begin, start, or commence (sometimes fol. by up): to open a campaign. |
| 51. | to uncover, lay bare, or expose to view. |
| 52. | to expand, unfold, or spread out: to open a map. |
| 53. | to make less compact, less closely spaced, or the like: to open ranks. |
| 54. | to disclose, reveal, or divulge. |
| 55. | to render accessible to knowledge, enlightenment, sympathy, etc.: to open one's mind. |
| 56. | to cut, blast, or break into: to open a safe with nitro. |
| 57. | to make or produce (an opening) by cutting or breaking, or by pushing aside or removing obstructions: to open a way through a crowd. |
| 58. | to make an incision or opening in: to open a boil. |
| 59. | Law.
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| 60. | Cards. to begin a hand by making (the first bid), placing (the first bet), or playing (a given card or suit) as the lead. |
| 61. | Nautical. to sail (a course) so that the apparent location of a distant fixed object changes with relation to a nearer fixed object (sometimes fol. by out). |
| 62. | to become open, as a door, building, box, or enclosure. |
| 63. | to afford access: a door that opens into a garden. |
| 64. | to have an opening, passage, or outlet: The room opens into a corridor. |
| 65. | (of a building, theater, etc.) to open its doors to the public: The museum opens at one o'clock. |
| 66. | to begin a session or term, as a school. |
| 67. | to begin a season, series of performances, or tour, as a theatrical company: The play will open in Boston. |
| 68. | to begin, start, or commence an activity: The game opened with the national anthem. |
| 69. | to part, or seem to part, so as to allow or reveal a passage: At last the cliffs opened to show us that we were heading for the sea. |
| 70. | to become disclosed or revealed. |
| 71. | to come into view; become more visible or plain. |
| 72. | to become receptive to knowledge, sympathy, etc., as the mind. |
| 73. | to disclose or reveal one's knowledge, thoughts, feelings, etc. |
| 74. | to unfold or expand, as a blossom, so as to reveal the interior. |
| 75. | to spread out or expand, as the hand or a fan. |
| 76. | to spread apart or separate, as pages of a book, newspaper, etc.: Open to page 32. |
| 77. | to spread or come apart; burst: The wound opened. |
| 78. | to become less compact, less closely spaced, or the like: The ranks began to open. |
| 79. | Cards. to make the first bet, bid, or lead in beginning a hand. |
| 80. | Hunting. (of hounds) to begin to bark, as on the scent of game. |
| 81. | an open or clear space. |
| 82. | the open air. |
| 83. | the open water, as of the sea. |
| 84. | an opening or aperture. |
| 85. | an opening or opportunity. |
| 86. | a contest or tournament in which both amateurs and professionals may compete, esp. in golf and tennis. |
| 87. | the open,
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| 88. | open up,
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