decenn.e ADJ 3 2 NOM S N POS
decenn.e ADJ 3 2 VOC S N POS
decenn.e ADJ 3 2 ABL S X POS
decenn.e ADJ 3 2 ACC S N POS
decennis, decennis, decenne ADJ [XXXDO] lesser
of ten years; lasting ten years; ten years old;

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.