teh(t)- + -o, probably from the same root as tehdas (and possibly tehdä). The forms with -ht- are likely original (compare Karelian tehto), and the forms with -h- may be generalized by analogy from the weak stem, although according to SSA, sound symbolicism may have also played a part.
teho
| Inflection of teho (Kotus type 1/valo, no gradation) | ||||
|---|---|---|---|---|
| nominative | teho | tehot | ||
| genitive | tehon | tehojen | ||
| partitive | tehoa | tehoja | ||
| illative | tehoon | tehoihin | ||
| singular | plural | |||
| nominative | teho | tehot | ||
| accusative | nom. | teho | tehot | |
| gen. | tehon | |||
| genitive | tehon | tehojen | ||
| partitive | tehoa | tehoja | ||
| inessive | tehossa | tehoissa | ||
| elative | tehosta | tehoista | ||
| illative | tehoon | tehoihin | ||
| adessive | teholla | tehoilla | ||
| ablative | teholta | tehoilta | ||
| allative | teholle | tehoille | ||
| essive | tehona | tehoina | ||
| translative | tehoksi | tehoiksi | ||
| abessive | tehotta | tehoitta | ||
| instructive | — | tehoin | ||
| comitative | See the possessive forms below. | |||