Difference between First and First Off

FIRST vs FIRST OFF: NOUN

The upper part of a duet, trio, etc., either vocal or instrumental; -- so called because it generally expresses the air, and has a preëminence in the combined effect.
Immediately.
The highest rank in an examination for honors: as, he got a first in mathematics. See double-first.
Same as first base (which see, above).
The interval and concord of the unison or prime. See unison and prime.
In music: The voice or instrument that takes the highest or chief part in its class, especially in an orchestra or chorus; a leader of a part or group of performers.
That which is first; the beginning. or that which makes or constitutes a beginning.
Time; time granted; respite: same as frist.
An honours degree of the highest class
The first or highest in an ordering or series
The fielding position of the player on a baseball team who is stationed at first base
The lowest forward gear ratio in the gear box of a motor vehicle; used to start a car moving
The time at which something is supposed to begin
The ordinal number matching the number one in a series.
The one coming, occurring, or ranking before or above all others.
The beginning; the outset.
The voice or instrument highest in pitch or carrying the principal part.
The transmission gear or corresponding gear ratio used to produce the range of lowest drive speeds in a motor vehicle.
The winning position in a contest.
First base.
A first baseman.
The first element in a countable series

Highest in pitch or chief among parts or voices or instruments or orchestra sections
Ranking above all others, as in importance or quality; foremost.
Corresponding in order to the number one.
Indicating the beginning unit in a series
Coming before all others in order or location.
Occurring or acting before all others in time; earliest.
Of, related to, or being a member of the US president's household.
Serving to begin
Being the gear producing the lowest drive speed
In the merchant service, same as First mate (above).
Same as Christian name. See under Name, n.
An officer in a merchant vessel next in rank to the captain.
The earliest effects or results.
The floor next above the ground floor.
Sunday; -- so called by the Friends.
Serving to set in motion
From the first or original source; without the intervention of any agent.
See under Blush.
Most eminent or exalted; most excellent; chief; highest.
Foremost; in front of, or in advance of, all others.
Preceding all others of a series or kind; the ordinal of one; earliest
Ranking above all others
Preceding all others in time or space or degree
The solid foundation of coarse stuff, on which the rest is placed; it is thick, and crossed with lines, so as to give a bond for the next coat.

Used to start a car moving
Highest, chief, principal, capital, foremost, leading.
Synonyms Primary, primordial, original, primitive, pristine, earliest. See comparison under primary.
Foremost in importance or estimation; before or superior to all others in character, quality, or degree: as, Demosthenes was the first orator of Greece; the part of first villain in a play; wheat of the first grade; specifically, in music, highest or chief among several voices or instruments of the same class: as, first alto; first horn.
Before all others in place or progression, rank, order of time, etc.
Hence Sooner; before doing or suffering (that is, so as not to do or suffer) some act or result: as, I will not do it, I will die first.
Being before all others; being the initial unit or aggregate in order of occurrence or arrangement as to time, place, or rank: the ordinal of one.
Foremost in time; preceding all others of the kind in order of time: as, Adam was the first man; I was the first guest to arrive.
Foremost in place; before all others from the point of view or consideration: as, the first man in a rank or line.
(idiom) (off/thing) From the start; immediately.

Freshman, Original, Prime, Premier, Outset, Best, Oldest, Start, Top, Maiden, Opening, Initial, Inaugural, Beginning, 1st

Premiere, Freshman, Original, Prime, Premier, Best, Oldest, Start, Top, Maiden, Opening, Initial, Inaugural, Beginning, 1st

If there is a colon, the first letter of the first word after the colon would be capitalized.
RATIONALETHE IMPORTANCE OF COUNSEL AT FIRST APPEARANCEAppearing for the first time in court without an attorney is a reality for indigent defendants in Michigan.
First Name Last Name, Edition if given and not first edition, vol.
FIRST AID ROOMStudents who become ill during class should request a pass from their teacher to go to the First Aid Room.
The first date you go to court is called the first mention date.
This is your first and only chance to make a first impression and really capture the attention of the committee.
In the first place, he need do nothing unless the movanthas met the first of his two burdens.
If there is no author listed, list the title of the article first, capitalizing the first word.
First, it is a decision of the First Circuit to which this Court owes direct allegiance.
First to file is basically, whoever files their claim first, will get paid first.

First off, a first aid kit is designed to treat basic, superficial wounds that people suffer every day.
First off, since I do not know where you are located, my answer is based off United States law so your mileage may vary.
First off let me start off by saying what I did and how I came up with this.
First off, nothing else can come about unless first there is faith in Jesus Christ.
First off, you need to learn that the first table row is repeating by default.
First off, I was shipped off the night of my Sweet Sixteen to marry some English boy named Arthur.
So, first things first, off with the pants!
First off, Tattoo artistry is First Amendment protected.
First off: This was our first Ikea trip.
First off, let me start off by saying how amazing Jay and Jim were.