Since vs. Ago — What's the Difference?

From then until now or between then and now

Gone by; past

Before now; ago

In the past

After some point in the past; at a subsequent time

Gone; gone by; gone away; passed; passed away.

Continuously from

Nearly gone; dead 19th century]]

Intermittently from

Before

During the period subsequent to the time when

Past; gone by; since; as, ten years ago; gone long ago.

Continuously from the time when

Gone by; or in the past;

Inasmuch as; because

In the past;

From a specified time in the past.

From: referring to a period of time ending in the present and defining it by the point in time at which it started, or the period in which its starting point occurred.

Continuously during that period of time.

At certain points during that period of time.

From the time that.

Because.

(obsolete) When or that.

From a definite past time until now; as, he went a month ago, and I have not seen him since.

In the time past, counting backward from the present; before this or now; ago.

When or that.

From the time of; in or during the time subsequent to; subsequently to; after; - usually with a past event or time for the object.

Seeing that; because; considering; - formerly followed by that.