An affection term used by Isildur when addressing his son Elendur, very likely a reduction of 1st sg. possessive ✱sén-nya “✱my child” from sén “child” (UT/274); hat-tip to Lokyt for suggesting this connection to me.
Quenya
senya
adjective. usual, usual, *common, typical
senya
noun. *my child
senwa
usual
senwa, also senya, adj. "usual" (VT49:22, 35). Notice that *senya* may conceivably also function as a genitive pronoun "his, her", derived from sen as the dative form of se #1 (compare ninya, menya**).
senwa
adjective. usual
úsië, an cé mo quernë cendelë númenna, ve senya
on the contrary, for if one turned the face westward, as was usual
Third phrase @@@
| |  I  | II |III|IV|  V  |VI|VII| |{lasi >> la >>}|lasir|>>|ūsir|úsir| |úsir|>> úsie| |{pan >> an >>}|an ké mo| |{nanquerne >> númequerna >>}|querne|{quernesse >>} quernes|querne|quere|querne| |immo|kanwarya|kendele| |númenna|(ve senya)|númenna| |(ve ...)| |(ve senwa)|(ve senya)|{i hyarma} númenna|ve senya|
@@@ the sense “common” suggested by Tamas Ferencz