{"era":"current","word":"landmark","meaning":"prominent feature; significant milestone","children":[{"era":"pre-1100","word":"landmearc","meaning":"boundary mark of land","children":[{"era":"pre-700","word":"land + mearc","meaning":"open land + boundary, border mark","children":[{"era":"prehistoric","word":"*lendʰ- + *merg-","meaning":"open land + boundary, border","children":[],"language":"Proto-Indo-European"}],"language":"Proto-Germanic"}],"language":"Old English"}],"language":"Modern English"}