I have seen the usage of the term "omnidirectional" in robotics, but I have not found a (precise) definition.
In the chapter Omni-Directional Robots from the book "Embedded Robotics", it is stated:
In contrast, a holonomic or omnidirectional robot is capable of driving in any direction
which seems to indicate that these words are synonyms.
What's an omnidirectional robot? What is the difference between a holonomic and an omnidirectional robot (if any)? What are examples of omnidirectional and holonomic robots (or other objects)?