(まれ)

まれに
adverb
rarely, seldom
descriptive
1. rarely, seldom, occasionally
Not happening often, on rare occasions.
I occasionally fail too.
(まれ)しか()えない
I can only rarely meet them.
This kind of weather is rarely seen.

(まれ)に means rarely or seldom.

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(まれ)に is slightly more literary/formal than 滅多(めった)ない.