arcan.o N 2 1 DAT S M
arcan.o N 2 1 ABL S M
arcanus, arcani N (2nd) M [XXXDO] lesser
confidant, trustworthy friend, keeper of secrets;
arcan.o N 2 2 DAT S N
arcan.o N 2 2 ABL S N
arcanum, arcani N (2nd) N [XXXCO]
secret, mystery; secret/hidden place;
arcan.o ADJ 1 1 DAT S M POS
arcan.o ADJ 1 1 DAT S N POS
arcan.o ADJ 1 1 ABL S M POS
arcan.o ADJ 1 1 ABL S N POS
arcanus, arcana, arcanum ADJ [XXXBO]
secret, private, hidden; intimate, personal; confidential; mysterious, esoteric
arcano ADV POS
arcano, arcanius, arcanissime ADV [XXXEO] uncommon
secretly, in confidence; in one's inner thoughts, privately;

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.