Synonym: ahead, before, beginning, chief, dominant, foremost, leading, main, preferably, primary, principal, rather, final, finally, last. Similar words: at first, first of all, first prize, the first person, at first sight, in the first place, first and foremost, upstairs. Meaning: [fɜrst /fɜːst] 
n. 1. the first or highest in an ordering or series 2. the first element in a countable series 3. the time at which something is supposed to begin 4. the fielding position of the player on a baseball team who is stationed at first of the bases in the infield (counting counterclockwise from home plate) 5. an honours degree of the highest class 6. the lowest forward gear ratio in the gear box of a motor vehicle; used to start a car moving. adj. 1. preceding all others in time or space or degree 2. indicating the beginning unit in a series 3. serving to set in motion 4. serving to begin 5. ranking above all others 6. highest in pitch or chief among parts or voices or instruments or orchestra sections 7. being the gear producing the lowest drive speed. adv. 1. before anything else 2. the initial time 3. before another in time, space, or importance 4. prominently forward.
n. 1. the first or highest in an ordering or series 2. the first element in a countable series 3. the time at which something is supposed to begin 4. the fielding position of the player on a baseball team who is stationed at first of the bases in the infield (counting counterclockwise from home plate) 5. an honours degree of the highest class 6. the lowest forward gear ratio in the gear box of a motor vehicle; used to start a car moving. adj. 1. preceding all others in time or space or degree 2. indicating the beginning unit in a series 3. serving to set in motion 4. serving to begin 5. ranking above all others 6. highest in pitch or chief among parts or voices or instruments or orchestra sections 7. being the gear producing the lowest drive speed. adv. 1. before anything else 2. the initial time 3. before another in time, space, or importance 4. prominently forward. 
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91. , the library is on the first floor.
92. Her first impulse was to run away.
93. First, fold the paper in half / in two.
94. I am still amazed that she won first prize.
95. The woman first bought a few small articles.
96. Speech is learnt in the first years of life.
97. Turn right at the first crossroads.
98. You have to be first, best or different.
99. You have to turn it on first.
100. She engaged first gear and pulled off.
101. He won his first race by six lengths at evens.
102. Most of the butterflies perish in the first frosts of autumn. Sentencedict.com
103. It was the first show to use the F-word and show nudity on stage.
104. Don't worry?it's quite usual to have a few problems at first.
105. He debated heating up the pot first before his friends came.
106. It was the first time a Green politician and a Labour minister had shared a platform .
107. The car value will depreciate by 2000 dollars in the first year.
108. How many days you heal the wounded and rescue the dying, fighting in the first line.
109. A thousandli journey is started by taking the first step.
110. Haiti's first elected president was deposed in a violent military coup .
111. The child refuses to eat this fruit without first picking out the stones.
112. There were three questions. The first two were relatively easy but the third one was hard.
113. I read the first few chapters and then got bored.
114. He became the uncrowned king of the East End, scoring 28 goals in his first season.
115. Sometimes, the key to making progress is to recognize how to take that very first step. Then you start your journey.
116. He is accredited with having first introduced this word into the language.
117. First the secretary read out the minutes of the last meeting.
118. The first safety razor was invented by company founder King C. Gillette in 1903.
119. She did/ran her first marathon in just under three hours.
120. At first, they refused to sign the agreement, but they caved in when they heard another firm was being approached.
More similar words: at first, first of all, first prize, the first person, at first sight, in the first place, first and foremost, upstairs, firm, burst, at worst, on fire, fire up, firmly, burst in, confirm, burst into, understand, catch fire, set fire to, burst out laughing.