1) Participle 1) Relating to participles 2) Verb 
• (a.) Having, or partaking of, the nature and use of a participle; formed from a participle; as, a participial noun. • (n.) A participial word.
Par`ti·cip'i·al adjective [ Latin participialis : confer English participal . See Participle .] Having, or partaking of, the nature and use of a participle; formed from a participle; as, a participial noun. Lowth. 
(Participle (participial)) Words made from verbs that are used either with an auxiliary to create a verb tense (e.g. was eaten) or as an adjective to describe a noun (e.g. an eating apple) or as a noun to label a thing (e.g. the singing was loud). Notice that because the participles all derive from verbs, they always retain the idea of action in th...
[adj] - (grammar) relating to participles
adjective of or relating to or consisting of participles; `participial inflections`