Kiiruseid

Kiiruseid is the partitive plural form of the Estonian noun kiirus, meaning speed or velocity. It is used to refer to speeds in an indefinite quantity or when the exact number of speeds is not specified. In this form, kiiruseid often appears with adjectives and other modifiers in the partitive case.

Usage of kiiruseid typically occurs in phrases that describe varying or multiple speeds without naming them individually. Common examples include erined kiiruseid (different speeds) and mitmeid kiiruseid (several speeds). The partitive plural is chosen in contexts where the focus is on the variety or extent of speeds rather than on a discrete, countable set of speeds.

Grammatical notes help distinguish kiiruseid from related forms. Kiirused is the nominative plural, used as the subject or predicate in a sentence, while kiiruste is the genitive plural, used in phrases that express possession or relation, such as limit or measure related expressions. The form kiiruseid thus marks a non-specific, collective sense of multiple speeds.

Related terms include kiirus (speed) and kiirendus (acceleration). While kiirus refers to how fast something is moving, kiirendus denotes the rate of change of that speed. Kiiruseid as a word form is primarily a grammatical variation used to talk about speeds in a non-countable or indeterminate sense.