The spelling of the word "itera" can be explained by using the International Phonetic Alphabet (IPA). The first sound in "itera" is the stressed sound of /i:/, which is a long "e" sound. The second sound is the unvoiced /t/ sound, followed by the neutral vowel /ə/, represented by the letter "e" in unstressed syllables. Finally, the last sound in "itera" is the unvoiced /r/ consonant, represented by the letter "r". Taking all of these sounds together, "itera" is spelled as /iːtərə/.