Antonym: night. Similar words: day after day, by day, all day, one day, today, the other day, yesterday, night and day. Meaning: [deɪ] 
n. 1. time for Earth to make a complete rotation on its axis 2. some point or period in time 3. the time after sunrise and before sunset while it is light outside 4. a day assigned to a particular purpose or observance 5. the recurring hours when you are not sleeping (especially those when you are working) 6. an era of existence or influence 7. a period of opportunity 8. the period of time taken by a particular planet (e.g. Mars) to make a complete rotation on its axis 9. the time for one complete rotation of the earth relative to a particular star, about 4 minutes shorter than a mean solar day 10. United States writer best known for his autobiographical works (1874-1935).
n. 1. time for Earth to make a complete rotation on its axis 2. some point or period in time 3. the time after sunrise and before sunset while it is light outside 4. a day assigned to a particular purpose or observance 5. the recurring hours when you are not sleeping (especially those when you are working) 6. an era of existence or influence 7. a period of opportunity 8. the period of time taken by a particular planet (e.g. Mars) to make a complete rotation on its axis 9. the time for one complete rotation of the earth relative to a particular star, about 4 minutes shorter than a mean solar day 10. United States writer best known for his autobiographical works (1874-1935). 
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61. New scientific discoveries are being made every day.
62. Something's been niggling her all day.
63. We're as different as night and day.
64. I spent the whole day cleaning.
65. He's been working hard all day.
66. We travelled further inland the next day.
67. We went on a day trip to the seaside.
68. It's been a cow of a day.
69. It was a cool day with fitful sunshine.
70. The house has been full of activity all day.
71. She left one day ahead of him.
72. A man should study till his dying day.
73. They've worked night and day to publicise their campaign.
74. One day she wandered further afield.
75. Keep something for a rainy day.
76. She commutes from Oxford to London every day.
77. I check my mailbox every other day.
78. He cycles to school every day.
79. I'll very likely be at home all day.
80. Many happy returns of the day!
81. Lunch is his main meal of the day.
82. A four - day suspension was imposed on her.
83. This must be my lucky day.
84. It was the worst day in my entire life.
85. I wasted my whole day away.
86. It was the perfect ending to the perfect day.
87. The police asked me questions all day.
88. The golden week of National Day is approaching.
89. The workmen sawed and hammered all day.
90. Take the medicine regularly three times a day.
More similar words: day after day, by day, all day, one day, today, the other day, yesterday, night and day, day and night.