There is no explanation of this word anywhere in the rules.
I have given some diagrams below. Which of the following movements are acceptable and would count as "...toward front contact or alignment with the enemy stand" ?
Rules wording.

Movement of the single stand to the side

A group move of two stands. One is already in the TZ of the enemy stand, and the other is not yet. At the end of movement only one are in TZ.

A group move of two stands. One is already in the TZ of the enemy stand, and the other is not yet. At the end of movement both are in TZ.

Movement of the single stand at an angle to the enemy's TZ.

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Here's an .odg file for LibreOffice with diagrams. In case someone needs them to make a diagram in response. LINK to Dropbox