An intransitive verb for “to rise” mentioned in various places in Tolkien’s later writings of the 1940s, 50s and 60s, based on the root √OR “rise” (PE17/64; PE22/114, 156). Tolkien usually described it as a ya-formative verb with a half-strong past oronye (PE17/64, 77; PE22/164), though Tolkien occasionally gave it a weak past oryane (PE22/115, 157).
Conceptual Development: The Qenya Lexicon of the 1910s had ᴱQ. oro- “rise” based on the early root ᴱ√ORO (QL/70). In a rejected page of verbs and roots from the Quenya Verbal System (QVS) written in 1948, Tolkien had [verb?] ᴹQ. oro, orro “up, rise (from ground)” derived from the root ᴹ√SRŌ (PE22/127), but in the main document he used ya-formative ᴹQ. orya- for “rise” (PE22/114-115), possibly the first appearance of this version of the verb. Tolkien sometimes gave the intransitive Quenya verb for “to rise” as ta-formative orta- with half-strong past oronte; see that entry for discussion.
Neo-Quenya: For purposes of Neo-Quenya, I prefer orya- “rise” with half-strong past oronye, and because Tolkien said “-ya was preferred for intransitives” (PE22/115).
oro- (2) vb. "rise" (LT1:256; Tolkien's later Quenya has orta-, but cf. oro #1)