Plural form of approach.
Dictionary of Nautical Terms
The trenches, zig-zags, saps, and other works, by which a besieger makes good his way up to a fortified place. (See TRENCHES.)
Military Dictionary and Gazetteer
The trenches or covered roads by which the besiegers convey ordnance, ammunition, and stores, and march troops to and from the parallels; also the trenches by means of which the successive parallels are established.
British National Corpus
Spoken Corpus Frequency
Rank popularity for the word 'approaches' in Spoken Corpus Frequency: #3586
The numerical value of approaches in Chaldean Numerology is: 7
The numerical value of approaches in Pythagorean Numerology is: 3