A prefix (and sometimes suffix) meaning “high” as in Tarcil “High Man” or Tarmenel “High Heaven”. It is often used in reference to royalty and nobility, as in Tarumbar “King of the World” or Sorontar “Lord of Eagles”, as well as the names of Númenorean kings and queens. It is related to the adjective tára “high” based on the root √TĀ/TAƷ of similar meaning (Ety/TĀ).
Quenya
tac-
verb. fasten
tar-
affix. high, high; [ᴹQ.] king or queen (in compounds)
arata
high, lofty, noble
arata adj. "high, lofty, noble" (PE17:49, 186). Also used as a a noun with nominal pl. form Aratar "the Supreme", the chief Valar, translation of the foreign word Máhani adopted and adapted from Valarin (WJ:402). Aratarya "her sublimity"; Varda Aratarya "Varda the lofty, Varda in her sublimity" (WJ:369). In one source, Aratar is translated as a singular: "High One" (PE17:186)
carasta-
verb. to build, to build, construct
halda
adjective. high, tall
panya-
verb. fix, set
panya- vb. "fix, set" (PAN). The verb napan- (q.v.), "add" or literally *"to-set", may argue the existence of a shorter stem #pan- as well.
tulca-
verb. fix, set up, establish
tulca- (2) ("k") vb. "fix, set up, establish" (LT1:270)
tá
high
tá 2) adj. "high" (LT1:264; there spelt tâ. This is hardly a valid word in Tolkien's later Quenya, but cf. tára "lofty".)
tána
high, lofty, noble
tána (meaning unclear, probably adj. "high, lofty, noble") (TĀ/TA3). Compare tára.
arata
high, lofty, noble
arata adj. "high, lofty, noble" (PE17:49, 186). Also used as a a noun with nominal pl. form Aratar "the Supreme", the chief Valar, translation of the foreign word Máhani adopted and adapted from Valarin (WJ:402). Aratarya "her sublimity"; Varda Aratarya "Varda the lofty, Varda in her sublimity" (WJ:369). In one source, Aratar is translated as a singular: "High One" (PE17:186)
tac- ("k") vb. "fasten" (the form tacë given in the Etymologies is translated "he fastens", evidently the 3rd person sg. aorist), pa.t. tancë (TAK)