1 : without the company of others : individually. 2 : single-handed.

Is there a word called singly?

apart from others; separately. one at a time; as single units. singlehanded; alone.

What do you mean by single?

: not having or including another : only one. : not married or not having a serious romantic relationship with someone. —used for emphasis after words like any, each, every, etc. single. noun.