1An adverb meaning 'a little', 'a bit', 'slightly' — refers to a small amount or degree. Extremely common in everyday Japanese; close to ちょっと.
少し休んでから、また仕事を続けよう。
Let's rest a little and then continue working.
コーヒーに砂糖を少し入れてください。
Please put a little sugar in the coffee.
今日は少し寒いですね。
It's a bit cold today, isn't it?
彼の日本語は少し上手になった。
His Japanese has gotten a little better.
2An adverb indicating a short period of time — 'a little while', 'a moment', as in 少し待つ ('wait a moment').
少し待ってください、すぐ戻ります。
Please wait a moment; I'll be right back.
少しの間、目を閉じて休んだ。
I closed my eyes and rested for a little while.
もう少しで終わるから、待っていてね。
I'll be done in a little while, so wait for me.
3An adverb indicating a short distance or small spatial gap — 'a little way', 'a short distance', as in 少し先 ('a little further ahead').
駅はここから少し離れています。
The station is a short distance from here.
少し先にコンビニがありますよ。
There's a convenience store a little further ahead.