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. 31. First impressions are most lasting.
32. The first step to virtue is to abstain from vice. 
33. He who purposes to be an author, should first be a student.
34. The first element of success is the determination to succeed.
35. We first make our habits, and then our habits make us.
36. The best go first.
37. There is always a first brave person who breaks step with the stam-peding masses fleeing in panic, who pauses to help another to his feet,creating his own eye in the storm, The stuff of heroes is made, forged in the midst of tragedy, in the blink of an eye.
38. What is a man's first duty? The answer is brief ; to be himself.
39. When one is about to act, one must reason first.
40. The first method for estimating the intellingence of a ruler is to look at the men he has around him.
41. Expericence is a hard teacher because she gives the test first, the lesson afterwards.
42. The cow that’s first up gets the first of the dew.
42. Sentencedict.com is a online sentence dictionary, on which you can find good sentences for a large number of words.
43. First come, first served.
44. He that will eat the nut must first crack the shell.
45. Some persons do first, think afterwards, and then repent for ever.
46. If at first you don't succeed try, try and try again.
47. I might say that success is won by three things: first, effort; second, more effort; third, still more effort.
48. Confidence in yourself is the first step on the road to success.
49. Women and children first.
50. He that would the daughter win, must with the mother first begin.
51. Whom the gods wish to destroy, they first made mad.
52. Who the gods wish to destroy they first call promising.
53. It is only fear first in the world that made gods.
54. No man can be a good ruler unless he has first been ruled.
55. I believe the first test of truly great man is his humility.
56. The first baseman was dumped from the team.
57. There are a couple more files to read first.
58. Please hammer down the lid first.
59. First, I'll explain the rules of the game.
60. He comes first in my estimation.
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.