n.
Pronunciation: ' s ē - ˌ n ī (- ə )l also ' se-
Function: adjective
Etymology: Latin senilis, from sen-, senex old, old man
Date: 1661
1 : of, relating to, exhibiting, or characteristic of old age < senile weakness> especially : exhibiting a loss of cognitive abilities (as memory) associated with old age
2 : approaching the end of a geological cycle of erosion
– se · nile · ly \ - ˌ n ī (- ə )l-l ē \ adverb