
einjährig
one-year-old / one-year
Being one year old or having a duration of one year.
Nach dem Abitur hat er ein einjähriges Praktikum im Ausland gemacht.
After finishing high school, he did a one-year internship abroad.
one-year-old / one-year
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one-year-old / one-year
Being one year old or having a duration of one year.
Nach dem Abitur hat er ein einjähriges Praktikum im Ausland gemacht.
After finishing high school, he did a one-year internship abroad.

annual
In botany, describing a plant that completes its entire life cycle from germination to seed formation within one year.
Sonnenblumen sind einjährige Pflanzen, die im Herbst absterben.
Sunflowers are annual plants that die off in autumn.
The word consists of the number 'ein' (one) and the ending '-jährig'. This ending, derived from 'Jahr' (year), is used to form adjectives for age or duration, e.g. 'zweijährig' (two-year-old / two-year), 'zehnjährig' (ten-year-old / ten-year).
Für die Stelle wird eine zweijährige Berufserfahrung vorausgesetzt.
Two years of professional experience are required for the position.
'Einjährig' (one-year-old / one-year) can refer to an age or a duration. The noun it describes makes the meaning clear: 'ein einjähriges Kind' (a one-year-old child; age) as opposed to 'ein einjähriger Vertrag' (a one-year contract; duration).
Unser Hund ist erst einjährig und noch sehr verspielt.
Our dog is only one year old and still very playful.
When referring to duration, 'einjährig' (one-year) is often combined with periods of time for training, work, or contracts: 'einjähriges Praktikum' (one-year internship), 'einjähriger Aufenthalt' (one-year stay), 'einjährige Garantie' (one-year warranty).
Das Gerät hat eine einjährige Garantie.
The device has a one-year warranty.
This special meaning belongs to the technical language of botany. You recognize it immediately from the context when plants, flowers, or gardening are being discussed.
Viele Kräuter in meinem Garten sind einjährig und müssen jedes Frühjahr neu gesät werden.
Many herbs in my garden are annuals and have to be sown again every spring.
annual / yearly
For contracts, „jährlich“ refers to an action or billing that takes place every year. „Einjährig“, by contrast, describes a fixed duration of one year. A fee can therefore be due annually, while the associated contract has a one-year term.

Das Abonnement hat eine einjährige Laufzeit.
The subscription has a one-year term.
Die Gebühr für das Abonnement wird jährlich abgerechnet.
The subscription fee is billed annually.