Antonym: customary. Similar words: occasionally, on occasion, professional, congressional, invasion, national, regional, missionary. Meaning: [ə'keɪʒənl] 
adj. 1. occurring from time to time 2. occurring or appearing at usually irregular intervals 3. occuring from time to time.
adj. 1. occurring from time to time 2. occurring or appearing at usually irregular intervals 3. occuring from time to time. 
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31. He only has occasional use of a car.
32. He works for us on an occasional basis.
33. An occasional glass of wine was his only indulgence.
34. He has the occasional cigar after dinner.
35. She needed an occasional prompt.
36. The occasional mortar burst near our truck.
37. An occasional polish will keep wall tiles looking good.
38. He should be allowed the occasional treat.
39. I enjoy the occasional glass of wine.
40. He reads the occasional book, but mostly just magazines.
41. She does have occasional lucid moments.
42. It's inevitable that doctors will make the occasional mistake.
43. He suffered occasional bouts of depression.
44. Chris has occasional casual work but mostly he is unemployed.
45. It was a superb performance,(sentencedict.com) despite occasional lapses of intonation.
46. Despite an occasional glimmer of hope, this campaign has not produced any results.
47. He spent five years in Paris, with occasional visits to Italy.
48. There was no light except for the occasional glow of a cigarette.
49. The house only needs an occasional coat of paint to keep it shipshape.
50. That sort of thing is quite occasional and not regular.
51. The coffee cups were placed on an antique occasional table.
52. We all need the occasional escape route from the boring, routine aspects of our lives.
53. Although a very religious man, he is still troubled by occasional doubts.
54. This thing isn't occasional.
55. We should have enough money left for the occasional trip.
56. Esther used to visit him for the occasional days and weekends.
57. He has the occasional cigarette, but mostly he smokes a pipe.
58. She flicked through a romantic paperback between occasional dips in the pool.
59. Her speech was serious, but not without the occasional touch of humour.
60. Her kindness and generosity cancel out her occasional flashes of temper.
More similar words: occasionally, on occasion, professional, congressional, invasion, national, regional, missionary, educational, additional, functional, nationalism, traditional, conventional, traditionally, international, institutional, instructional, organizational, constitutional, casino, cast aside, personal, personally, occupation, on a large scale, version, tension, mission, mansion.