eissä

Eissä is not a stand-alone Finnish word. In Finnish grammar, -issa and -issä are the inessive plural endings, used to mark “in, inside” in reference to multiple items. The sequence eissä appears when the stem of a noun ends with the front vowel e and takes the plural inessive ending -issä; thus words ending in -e can yield forms such as tiedeissä.

In practice, the inessive plural indicates location within more than one item. The choice between -issa and -issä follows Finnish vowel harmony: words with back vowels (such as a, o, u) generally take -issa, while words with front vowels (such as ä, ö, y, i, e) take -issä. The final spelling therefore depends on the noun’s ending vowels and its stem.

Examples

- taloissa means “in the houses” (talo = house; back vowels, plural inessive -issa).

- kissoissa means “in the cats” (kissa = cat; front vowels, plural inessive -issä).

- tiedeissä means “in the sciences” (tiede = science; front vowels, plural inessive -issä).

Usage notes

- eissä occurs specifically as part of the suffix after stems ending in front vowels, producing forms that end with eissä, as in tiedeissä.

- The concept is a feature of Finnish morphology rather than a separate lexical item; it reflects how location and plurality interact in noun inflection.

See also

- Finnish grammar

- Inessive case

Note: For clarity, “eissä” is best viewed as a morphological ending pattern rather than a distinct word.