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. 121. She engaged first gear and pulled off.
122. Call the police at the first sign of trouble.
123. He won his first race by six lengths at evens.
124. Most of the butterflies perish in the first frosts of autumn.
125. It was the first show to use the F-word and show nudity on stage.
126. Don't worry?it's quite usual to have a few problems at first.
127. The first step in a job search is to prepare an up-to-date CV.
128. He debated heating up the pot first before his friends came.
129. It was the first time a Green politician and a Labour minister had shared a platform .
130. The film has been shown in its entirety for the first time.
131. The car value will depreciate by 2000 dollars in the first year.
132. He is still glorying in the success of his first Hollywood film.
132. Sentencedict.com try its best to collect and build good sentences.
133. How many days you heal the wounded and rescue the dying, fighting in the first line.
134. A thousandli journey is started by taking the first step.
135. First check that the accident victim doesn't have an obstructed airway.
136. After the First World War Germany conceded a lot of land to her neighbours.
137. Haiti's first elected president was deposed in a violent military coup .
138. The child refuses to eat this fruit without first picking out the stones.
139. There were three questions. The first two were relatively easy but the third one was hard.
140. I read the first few chapters and then got bored.
141. He became the uncrowned king of the East End, scoring 28 goals in his first season.
142. Sometimes, the key to making progress is to recognize how to take that very first step. Then you start your journey.
143. He is accredited with having first introduced this word into the language.
144. First the secretary read out the minutes of the last meeting.
145. The first safety razor was invented by company founder King C. Gillette in 1903.
146. She did/ran her first marathon in just under three hours.
147. At first there was a lack of trust between them.
148. At first, they refused to sign the agreement, but they caved in when they heard another firm was being approached.
149. There is no substitute for hard work. First in, last out.
150. The first snow came. How beautiful it was, falling so silently all day long, all night long, on the mountains, on the meadows, on the roofs of the living, on the graves of the dead!
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.