What is the meaning of Sí?

yes (word used to indicate agreement or acceptance)

yes (affirmation; commonly used to respond affirmatively to a question)

the opposite of 'not'

yes

Reflexive prepositional pronoun; oneself, himself, herself, itself, themselves, yourself; each other, one another

on the ground

Marker of the Progressive aspect (with a focus on presence).

positive (for a test)

to sting

heart

foot, paw

foot

mother (female parent)

she

it

alternative spelling of síi

to see

to find

imperative of síggja: behold

ski

to howl, cry, whiz, shriek, screech, shrill

always

fairy mound, tumulus

she

it

yes, yeah,

Used to give positive emphasis to a verb, which is often replaced. Functions similarly to English do.

hello?

yes; aye, ay; approbation, acceptance

prepositional form of se

1. himself, herself, itself, themself, themselves

   himself, herself, itself, themself, themselves

   yourself, yourselves

   Like other masculine words, masculine pronouns can be used when the gender of the subject is unknown or when the subject is plural and of mixed gender.

   Treated as if it were third person for purposes of conjugation and reflexivity.

   If le or les precedes lo, la, los, or las in a clause, it is replaced with se (e.g. se lo dije instead of *le lo dije).

   Used primarily in Spain.

   Only used in certain circumstances and rarely as a subject pronoun.

   Source: wiktionary.org