You. Forth. Simplicity.

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word
Every Forth language element that can be used interactively or within a program is called a word. Most of the time words are delimited by spaces.

definition
The source code for a word.

TOS
Top of stack

NOS
Next on stack, the item below TOS

TORS
Top of return stack.

NORS
Next on return stack, the item below TORS

CELL
The only real data type recognized by RetroForth. A CELL is a 32-bit integer. You can use special words to fetch and store bytes (8 bits) or words (16 bits). Internally all values, handles, and types are stored and dealt with as CELLS.