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.

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
'jährlich' and 'einjährig' both have to do with a year, but they do not describe the same thing. 'jährlich' means that something happens every year or applies for one year. 'einjährig' means that something is one year old or lasts exactly one year. For plants, 'einjährig' means that the plant has its whole life cycle within one year. Learners can easily confuse the words because both contain the word 'Jahr' (year). As a guide: 'jährlich' is about repetition, while 'einjährig' is about age or duration.

Der Kurs ist einjährig und endet im nächsten Sommer.
The course lasts one year and ends next summer.
Das Museum bietet jährlich eine große Ausstellung zur Stadtgeschichte an.
The museum offers a major exhibition on the city's history every year.