Two words
May be 2 words combined (imp+uno) If not obvious, probably incorrect
imp N 9 8 X X M
imp., abb. N M [XXXDX] lesser
emperor (abb.); general; ruler; commander (-in-chief);
un.o NUM 1 1 ABL S M CARD
un.o NUM 1 1 ABL S N CARD
unus -a -um, primus -a -um, singuli -ae -a, semel NUM [XXXAX]
1 - (CARD answers 'how many');
un.o ADJ 1 3 ABL S M POS
un.o ADJ 1 3 ABL S N POS
unus, una, unum (gen -ius) ADJ [XXXEO] uncommon
alone, a single/sole; some, some one; only (pl.); one set of (denoting entity);
*

Credits:
This, our local install of the popular standby Whitaker's Words, is possible thanks to the resurrection of the venerable project at William Whitaker's Words, where you will also find extensive documentation. The corresponding GitHub repository is where you can submit issues about missing forms and analyses.
This web interface by Walter M. Shandruk.