itseisaika

== Finnish == === Etymology === itseis- +‎ aika === Pronunciation === IPA(key): /ˈitsei̯sˌɑi̯kɑ/, [ˈits̠e̞i̯s̠ˌɑ̝i̯kɑ̝] Rhymes: -ɑikɑ Syllabification(key): it‧seis‧ai‧ka Hyphenation(key): itseis‧aika === Noun === itseisaika (relativity) proper time ==== Declension ====