Origin: Germanic Old English prefix
Forth has 10 different meanings across 4 categories:
Noun · Adverb · Prep · Proper Noun
a river in southern Scotland that flows eastward to the Firth of Forth
"They sailed north along the coast to visit our family on the banks of the Forth, the river flowing into the sea just beyond."
Misspelling of fourth.
"The teacher corrected my spelling error, pointing out that I had written "fourth" as "forth.""
In plain English: It's just a typo for the number four, meaning position or order after three.
"The team came forth with a surprising victory."
Usage: Do not use "forth" as a noun to mean the number four; that is a misspelling of "fourth." Instead, reserve "forth" exclusively for its adverbial meaning indicating movement forward or progression in time.
Misspelling of fourth.
"The teacher corrected my spelling error, telling me to change "foth" back to "fourth.""
In plain English: Forth means going forward or moving ahead from where you are.
Usage: Forth" is never an adjective; it is a preposition or adverb meaning forward or onward. If you need to describe something as coming after three others, use the adjective "fourth" instead."
from a particular thing or place or position (`forth' is obsolete)
"ran away from the lion"
"wanted to get away from there"
"sent the children away to boarding school"
"the teacher waved the children away from the dead animal"
"went off to school"
"they drove off"
"go forth and preach"
Forward in time, place or degree.
"The clock struck noon and we finally set forth on our journey to the mountains."
In plain English: Forth means moving forward or going out from where you are.
"We marched forth into the bright sunlight after years of hiding in the shadows."
Usage: Use forth only when you mean moving forward through time, such as in the phrase "henceforth." Do not use it to describe physical direction or location, which requires the word "for.
Forth from; out of.
"The doctor urged him to step forth from the crowded waiting room and get some fresh air."
A river in Scotland that flows for about 47 km (29 miles) from The Trossachs through Stirling to the Firth of Forth on the North Sea.
"The engineer decided to rewrite the robot's movement logic in Forth because its stack-based architecture made it ideal for the embedded controller."
An imperative, stack-based high-level programming language, used mostly in control applications.
Forth comes from Old English forþ, which originally meant "forward" or "on the other side." The word traveled into modern English with this core sense of moving ahead or beyond a point.