1-ary noun suffix [ME -arie, fr. OF & L; OF -aire, -arie, fr. L -arius, -aria, -arium, fr. -arius, adj. suffix]
1 : thing belonging to or connected with; esp : place of <ovary>
2 : person belonging to, connected with, or engaged in <functionary>
(C) 1996 Zane Publishing, Inc. and Merriam-Webster, Incorporated

so, dictionary <> a thing connected with words
stationary <> fixed (connected) in place