We found 4 dictionaries that define the word proper motions:

General (3 matching dictionaries)

1. proper motions: Merriam-Webster
2. proper motions: Collins English Dictionary
3. proper motions: Wiktionary

Computing (1 matching dictionary)

4. Proper motions: Encyclopedia

▸ Words similar to proper motions ▸ Usage examples for proper motions ▸ Idioms related to proper motions ▸ Wikipedia articles (New!) ▸ Words that often appear near proper motions ▸ Rhymes of proper motions ▸ Invented words related to proper motions