is by definition an aircraft with no engine.

[hhtt21]

1.A glider is by definition an aircraft with no engine.

1 is the original.

To what positions can we change by definition?

These are my suggestions/tryings.

2. "A glider by definition is an aircraft with no engine."

https://www.merriam-webster.com/dictionary/by definition

Thank you.

 

[jutfrank]

By definition, a glider is an aircraft with no engine.
A glider, by definition, is an aircraft with no engine.
A glider is, by definition, an aircraft with no engine.
A glider is an aircraft with no engine, by definition.

All four are possibilitiies.