noun, adjective, verb, based, bas⋅ing.| 1. | the bottom support of anything; that on which a thing stands or rests: a metal base for the table. |
| 2. | a fundamental principle or groundwork; foundation; basis: the base of needed reforms. |
| 3. | the bottom layer or coating, as of makeup or paint. |
| 4. | Architecture.
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| 5. | Botany, Zoology.
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| 6. | the principal element or ingredient of anything, considered as its fundamental part: face cream with a lanolin base; paint with a lead base. |
| 7. | that from which a commencement, as of action or reckoning, is made; a starting point or point of departure. |
| 8. | Baseball.
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| 9. | a starting line or point for runners, racing cars, etc. |
| 10. | (in hockey and other games) the goal. |
| 11. | Military.
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| 12. | Geometry. the line or surface forming the part of a figure that is most nearly horizontal or on which it is supposed to stand. |
| 13. | Mathematics.
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| 14. | Also called base line. Surveying. See under triangulation (def. 1). |
| 15. | Painting.
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| 16. | Photography. a thin, flexible layer of cellulose triacetate or similar material that holds the light-sensitive film emulsion and other coatings, esp. on motion-picture film. |
| 17. | Chemistry.
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| 18. | Grammar. the part of a complex word, consisting of one or more morphemes, to which derivational or inflectional affixes may be added, as want in unwanted or biolog- in biological. Compare root 1 (def. 11), stem 1 (def. 16). |
| 19. | Linguistics. the component of a generative grammar containing the lexicon and phrase-structure rules that generate the deep structure of sentences. |
| 20. | Electronics.
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| 21. | Stock Exchange. the level at which a security ceases a decline in price. |
| 22. | Heraldry. the lower part of an escutcheon. |
| 23. | bases, Armor. a tonlet formed of two shaped steel plates assembled side by side. |
| 24. | Jewelry. pavilion (def. 6). |
| 25. | in base, Heraldry. in the lower part of an escutcheon. |
| 26. | serving as or forming a base: The walls will need a base coat and two finishing coats. |
| 27. | to make or form a base or foundation for. |
| 28. | to establish, as a fact or conclusion (usually fol. by on or upon): He based his assumption of her guilt on the fact that she had no alibi. |
| 29. | to place or establish on a base or basis; ground; found (usually fol. by on or upon): Our plan is based on a rising economy. |
| 30. | to station, place, or situate (usually fol. by at or on): He is based at Fort Benning. The squadron is based on a carrier. |
| 31. | to have a basis; be based (usually fol. by on or upon): Fluctuating prices usually base on a fickle public's demand. |
| 32. | to have or maintain a base: I believe they had based on Greenland at one time. |
| 33. | get to first base. first base (def. 2). |
| 34. | off base,
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| 35. | on base, Baseball. having reached a base or bases: Two men are on base. |
| 36. | touch base with, to make contact with: They've touched base with every political group on campus. |
,| 1. | to put the hand, finger, etc., on or into contact with (something) to feel it: He touched the iron cautiously. |
| 2. | to come into contact with and perceive (something), as the hand or the like does. |
| 3. | to bring (the hand, finger, etc., or something held) into contact with something: She touched a match to the papers. |
| 4. | to give a slight tap or pat to with the hand, finger, etc.; strike or hit gently or lightly. |
| 5. | to come into or be in contact with. |
| 6. | Geometry. (of a line or surface) to be tangent to. |
| 7. | to be adjacent to or border on. |
| 8. | to come up to; reach; attain. |
| 9. | to attain equality with; compare with (usually used with a negative): a style that cannot touch that of Shakespeare. |
| 10. | to mark by strokes of the brush, pencil, or the like. |
| 11. | to mark or relieve slightly, as with color: a gray dress touched with blue. |
| 12. | to stop at (a place), as a ship: The ship touched shore several times during the cruise. |
| 13. | to treat or affect in some way by contact. |
| 14. | to affect as if by contact; tinge; imbue. |
| 15. | to affect with some feeling or emotion, esp. tenderness, pity, gratitude, etc.: Their sufferings touched his heart. |
| 16. | to handle, use, or have to do with in any way (usually used with a negative): She can't touch the money until she's 21. |
| 17. | to eat or drink; consume; taste (usually used with a negative): He won't touch another drink. |
| 18. | to lay hands on, often in a violent manner: Don't you touch this child! |
| 19. | to deal with or treat in speech or writing. |
| 20. | to refer or allude to. |
| 21. | to pertain or relate to: a critic in all matters touching the kitchen. |
| 22. | to be a matter of importance to; make a difference to; affect: This grave decision touches all of us. |
| 23. | Metallurgy. to stamp (metal) as being of standard purity. |
| 24. | Slang. to apply to for money, or succeed in getting money from: He touched me for five dollars. |
| 25. | Slang. to steal from. |
| 26. | Archaic.
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| 27. | to place the hand, finger, etc., on or in contact with something. |
| 28. | to come into or be in contact. |
| 29. | to make a stop or a short call at a place, as a ship or those on board (usually fol. by at). |
| 30. | the act or state of touching; state or fact of being touched. |
| 31. | that sense by which anything material is perceived by means of physical contact. |
| 32. | the quality of something touched that imparts a sensation: an object with a slimy touch. |
| 33. | a coming into or being in contact. |
| 34. | mental or moral perception, sensitivity, or understanding: He has a marvelous touch in dealing with people. |
| 35. | ability, skill, or dexterity; knack: to lose one's touch. |
| 36. | Fencing. the contact of the point of a foil or épée or the point or edge of the blade of a saber with a specified portion of the opponent's body, counting one point for the scorer. |
| 37. | close communication, agreement, sympathy, or the like: to be out of touch with reality; Let's keep in touch. |
| 38. | a slight stroke or blow. |
| 39. | a slight attack, as of illness or disease: a touch of rheumatism. |
| 40. | a slight added action or effort in doing or completing any piece of work: to provide the finishing touches. |
| 41. | manner of execution in artistic work. |
| 42. | the act or manner of touching or fingering a keyboard instrument. |
| 43. | the mode of action of the keys of an instrument, as of a piano or typewriter. |
| 44. | Change Ringing. a partial series of changes on a peal of bells. |
| 45. | a stroke or dash, as with a brush, pencil, or pen. |
| 46. | a detail in any artistic work. |
| 47. | a slight amount of some quality, attribute, etc.: a touch of sarcasm in his voice. |
| 48. | a slight quantity or degree: a touch of salt. |
| 49. | a distinguishing characteristic or trait: the touch of the master. |
| 50. | quality or kind in general. |
| 51. | an act of testing something. |
| 52. | something that serves as a test; touchstone. |
| 53. | Slang.
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| 54. | Slang. theft. |
| 55. | Metallurgy.
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| 56. | Soccer. the area outside the touchlines. |
| 57. | Rugby. either of the touchlines or the area outside of the touchlines. |
| 58. | touch down, (of an airplane) to come into contact with the ground; land. |
| 59. | touch off,
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| 60. | touch on or upon,
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| 61. | touch up,
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| 62. | put the touch on, Informal. to try to borrow money from: Willie put the touch on me for another ten last night. |
| 63. | touch base with. base 1 (def. 36). |

Any of a number of bitter-tasting, caustic materials. Technically, a material that produces negative ions in solution. A base is the opposite of an acid and has a pH of 7 to 14. A given amount of a base added to the same amount of an acid neutralizes the acid; water and a salt are produced. Alkalis are bases; ammonia is a common base.
base
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touch
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base (bās)
n.
The part of an organ nearest its point of attachment.
A fundamental ingredient; a chief constituent of a mixture.
Any of a large class of compounds, including the hydroxides and oxides of metals, having a bitter taste, a slippery solution, the capacity to turn litmus blue, and to react with acids to form salts.
A molecular or ionic substance capable of combining with a proton to form a new substance. Also called Brønsted base.
A nitrogen-containing organic compound that combines in such a manner.
A substance that provides a pair of electrons for a covalent bond with an acid.
touch (tŭch)
n.
The physiological sense by which external objects or forces are perceived through contact with the body.
Digital examination.
touch base with
Make contact or renew communications with, as in I'll try to touch base with you when I'm in Ohio, or The candidate touched base with every ethnic group in the city. This idiom comes from baseball, where a runner must touch each base without being tagged before a run can be scored.