Along Definition

ə-lông, ə-lŏng

preposition

Over the length of.

Walked along the path.

American Heritage

On or beside the length of; over or throughout the length of.

We hiked along the trail; along the driveway there is a hedge.

Webster's New World

On a line or course parallel and close to; continuously beside.

Rowed along the shore; the trees along the avenue.

American Heritage

In the course of.

Along the way.

Webster's New World

In accordance with.

The committee split along party lines over the issue.

American Heritage

adverb

Forward; onward.

We drove along, admiring the view. Farther along, we passed a hitchhiker.

American Heritage

In a line; lengthwise.

Webster's New World

As company.

Bring your friend along.

American Heritage

Progressively forward or onward.

He walked along by himself.

Webster's New World

In accompaniment or association; together.

Packed an atlas along with other books.

American Heritage

Synonyms:

Antonyms:

Idioms, Phrasal Verbs Related to Along

Middle English from Old English andlang extending opposite and- facing ant- in Indo-European roots lang long long¹

From American Heritage Dictionary of the English Language, 5th Edition
From Middle English, from Old English andlang from prefix and- + lang (“long”).

From Wiktionary