diff --git a/Gemfile.lock b/Gemfile.lock
index dd64b4d..fd68e22 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -77,7 +77,7 @@ GEM
     terminal-table (3.0.2)
       unicode-display_width (>= 1.1.1, < 3)
     unicode-display_width (2.6.0)
-    webrick (1.8.1)
+    webrick (1.8.2)
 
 PLATFORMS
   arm64-darwin
diff --git a/dictionary.md b/dictionary.md
new file mode 100644
index 0000000..457ec6f
--- /dev/null
+++ b/dictionary.md
@@ -0,0 +1,19 @@
+---
+title: dictionary
+layout: home
+nav_order: 3.5
+---
+
+- [CAN](https://www.csselectronics.com/pages/can-bus-simple-intro-tutorial) - (Controller Area Network) - A [vehicle bus](https://en.wikipedia.org/wiki/Vehicle_bus) standard designed to allow [microcontrollers](https://www.geeksforgeeks.org/digital-logic/microcontroller-and-its-types/) and devices to communicate with each other's applications. It is a [differential](https://www.allaboutcircuits.com/technical-articles/the-why-and-how-of-differential-signaling/), [message-based protocol](https://en.wikipedia.org/wiki/Message_passing) that uses two wires to communicate 
+
+- [I2C](https://learn.sparkfun.com/tutorials/i2c/all) - (Inter-Integrated Circuit -- "I Squared C") - a [synchronous](https://en.wikipedia.org/wiki/Synchronous_circuit), [single-ended](https://en.wikipedia.org/wiki/Single-ended_signaling), [serial communication bus](https://en.wikipedia.org/wiki/Serial_communication). It is widely used for attaching lower-speed peripheral ICs to processors and microcontrollers in short-distance, intra-board communication. Here is a [great video](https://www.youtube.com/watch?v=CAvawEcxoPU) explaining the protocol. 
+
+- [SPI](https://learn.sparkfun.com/tutorials/serial-peripheral-interface-spi/all) - (Serial Peripheral Interface -- "Spy") - A [synchronous](https://en.wikipedia.org/wiki/Synchronous_circuit) [serial communication bus](https://en.wikipedia.org/wiki/Serial_communication), used primarily in embedded systems for short-distance wired communication between integrated circuits. It uses a Master/Slave architecture where the master controls the clock and uses chip select pins to determine which device to interface with. 
+
+- [PCB](https://en.wikipedia.org/wiki/Printed_circuit_board) - (Printed Circuit Board) - a medium used to connect or "wire" components to one another in a circuit. It takes the form of a [laminated](https://en.wikipedia.org/wiki/Lamination) sandwich structure of conductive and insulating layers: each of the conductive layers is designed with a pattern of [traces](https://www.pcbgogo.com/Blog/PCB_Trace___Everything_You_Need_To_Know.html), [planes](https://resources.pcb.cadence.com/blog/2020-the-pcb-ground-plane-and-how-it-is-used-in-your-design) and other features (similar to wires on a flat surface) etched from one or more sheet layers of copper laminated onto and/or between sheet layers of a non-conductive substrate. 
+
+- [Telemetry](https://en.wikipedia.org/wiki/Telemetry) - the on site collection of measurements or other data at remote points and their automatic transmission to receiving equipment (telecommunication) for monitoring. 
+
+- [Embedded Systems](https://en.wikipedia.org/wiki/Embedded_system) - a computer system—a combination of a computer processor, computer memory, and input/output peripheral devices that has a dedicated function within a larger mechanical or electronic system. 
+
+- [LoRa](https://en.wikipedia.org/wiki/LoRa) - (Long Range Wide Area Network -- "Laura WAN") - license-free sub-gigahertz radio frequency wireless standard. Used to send small amounts of data over long distances. 
\ No newline at end of file