ichidan verb, intransitive verb
resemble each other; be alike
Describes two or more things that look similar to each other. Often used in the form あいにている.
あの二人は顔がよくあいにている。
Those two have faces that resemble each other a lot.
この二つの絵はどこかあいにている。
These two paintings resemble each other in some way.
似る is the common word for 'resemble'. 相似る is a less common variant with the same meaning, often used in the compound 相似 (そうじ, 'similarity').
Compound of 相 (あい, 'mutual') and 似る (にる, 'resemble'). The exact historical derivation is uncertain, but it follows a common pattern of prefixing 相 to verbs to indicate reciprocal action.