A noun for “fortification, strengthening” in the Quenya Verbal System (QVS) from 1948, a combination of turya- “strengthen” and the general action verbal suffix -nde (PE22/110). This word also appeared with the gloss “fortification” in both the first and second versions of the Tengwesta Qenderinwa from the 1930s (TQ1: PE18/45) and around 1950 (TQ2: PE18/95) respectively. In TQ1 and TQ2 it referred to the strengthening of sound (more specifically a-fortification), so I think this noun can refer to both physical and metaphorical strengthening.
Quenya
turyande
verb. strengthening, fortification
turyande
verb. fortification
turyandë
noun. fortification, fortification, [ᴹQ.] strengthening
antoryamë
strengthening
antoryamë noun "strengthening", used of various manipulations of a stem, such as lengthening vowels or consonants or turning a consonant or a vowel into a "blend" (see ostimë) (VT39:9)
antoryamë
noun. strengthening
fortification